Duke_of_Zork is spot on. There are many players on FOA online which are not human but FOA pretend they are. I have checked this and this seems totally wrong. Different names make the same mistake in the opening in uncommon lines. This is impossible. This should not be something to spend your money on.
What is FIDE Online Arena? How does it work? Is FIDE Arena Elo = FIDE ELO

It is not a waste of money. I got the just 2 weeks ago and with my fide rating & the AFM title, I have seen a lot of improve in my final standings of the tournament.
It just takes 20 Euroes to sign up and 5 to claim the title. I've seen many people who have not claimed the ACM title but as soon as they get the AFM title they will pay 5 euroes. This too saves money. Due to this they will not need to pay the money for ACM title but only for AFM title.
ACM title (Arena Candidate Master- 1100> rating for 150 blitz games or 100 rapid or 50 bullet.
AFM (Arena Fide Master)- 1400> rating for 150 blitz games or 100 rapid or 50 bullet.
AIM (Arena International Master)- 1700> rating for 150 blitz games or 100 rapid or 50 bullet.
AGM (Arena Grandmaster)- 2000> rating for 150 blitz games or 100 rapid or 50 bullet.
It is not a waste of money. I got the just 2 weeks ago and with my fide rating & the AFM title, I have seen a lot of improve in my final standings of the tournament.
It just takes 20 Euroes to sign up and 5 to claim the title. I've seen many people who have not claimed the ACM title but as soon as they get the AFM title they will pay 5 euroes. This too saves money. Due to this they will not need to pay the money for ACM title but only for AFM title.
ACM title (Arena Candidate Master- 1100> rating for 150 blitz games or 100 rapid or 50 bullet.
AFM (Arena Fide Master)- 1400> rating for 150 blitz games or 100 rapid or 50 bullet.
AIM (Arena International Master)- 1700> rating for 150 blitz games or 100 rapid or 50 bullet.
AGM (Arena Grandmaster)- 2000> rating for 150 blitz games or 100 rapid or 50 bullet.
Thanks for the information
Comparing any online FIDE rating vs the rest of the chess sites across the planet is like comparing day and night. The correct rating that borders on perfection is called Arena FIDE. Disdaining FOA classifications also seems to me much more like envy of those who do it than anything else that has any practical basis. FOA classifications perfectly serve players with high average playing strength and who do not have the money, time, and often not even the interest in obtaining a title in the conventional way. But the most important thing of all in FIDE Arena, and which goes unnoticed by many players, is the tool that notifies you that a human player has not been found and that a bot from the site will be activated to play against you, not wanting to play against a disgusting machine, just cancel the challenge. Chess.com, lichess and others should copy this extremely important tool, why don't they? I leave the answer to everyone's imagination...

.... But the most important thing of all in FIDE Arena, and which goes unnoticed by many players, is the tool that notifies you that a human player has not been found and that a bot from the site will be activated to play against you, not wanting to play against a disgusting machine, just cancel the challenge. Chess.com, lichess and others should copy this extremely important tool, why don't they? I leave the answer to everyone's imagination...
Chess.com does not want bots in the player pools. If a player wants to play a bot, there's a section for that.

Because there are no players they use bots. Sometimes these are real bots and you know it but they use also so called players that in reality do not exist and they are bots also. Fake. I like the comment of Martin Stahl.

This titles are recognised by FIDE ... even in over the board tournaments. take a look this example. The red cicles are FIDE ONLINE Arena titles. And this is an official OTB tournament.

This titles are recognised by FIDE ... even in over the board tournaments. take a look this example. The red cicles are FIDE ONLINE Arena titles. And this is an official OTB tournament.
They are shown in FIDE OTB tournaments but aren't OTB titles and aren't recognized by the site which only looks at OTB titles gained through OTB regular rated chess.

Of course it is recognised by the tournament.
Look, there is one problem on this discussion. The most part of the negative views are written by people who never tried to get those titles. Because they are difficult to get by a medium amateur chess player, So, it better to say like the fable of The fox and the grapes :
"What a fool I am," he said. "Here I am wearing myself out to get a bunch of sour grapes that are not worth gaping for."
And off he walked very, very scornfully.
There are many who pretend to despise and belittle that which is beyond their reach.

Well I am a bit more nuanced these days about this site. It has improved for sure. The ratings are on the low site of the spectrum. I am a 2000 player on chess.com and I hit 2300 on Lichess. On FOA for me it is hard to get to 1700 so you can see it is not easy to become a AIM and it is very hard to become a AGM for a player in my range and I think in general too considering I am in the 99% percentile range on chess.com. There are some old titleholders who lost 100’s of points (myself included) when the site transitioned to the new owner. So you see some AGM’s in the 1600 - 1800 in the current rating range who were above 2000 on the old site. I think you are aprox. 200 points underrated when comparing to real Fide rating so to become an AIM nowadays you must be at least a 1900 player OTB and a 2200 OTB FIDE player to become AGM. Quite a challenge I would say. There are also a lot of talented kids from India playing on this site I mentioned. Have fun!

Look guy's don't make someone else achievement like nothing, fide online arena have truly strong players and you have to play 50 rapid game with performance rating of at least 1700 to earn the FIDE ARENA MASTER this is the age of computer and even grandmaster nowadays play online more than on the board, the Magnus himself in an interview said i prefer playing on my computer, so if you want to earn the arena title don't let others people make it like nothing, and trust me it is quite an achievement that i am currently trying to make myself play better to earn the FIDE Arena Master

Of course it is recognised by the tournament.
Look, there is one problem on this discussion. The most part of the negative views are written by people who never tried to get those titles. Because they are difficult to get by a medium amateur chess player, So, it better to say like the fable of The fox and the grapes :
"What a fool I am," he said. "Here I am wearing myself out to get a bunch of sour grapes that are not worth gaping for."
And off he walked very, very scornfully.
There are many who pretend to despise and belittle that which is beyond their reach.
Hands down best comment
So basically FIDE Online Arena elo is nothing different from chess.com elo. In the sense that it means absolutely nothing outside of the site?
The FOA titles are official, they are displayed on the player’s FIDE profile as well as at official OTB events. Unlike over-the-board titles, the FOA titles do not differentiate by sex and apply to both women and men equally. The online titles are automatic: once the player reaches a certain rating and is able to maintain it for a required number of games, they are eligible for the online title. You can obtain the FOA Title recognized by FIDE by playing FOA-rated games on FIDE Online Arena. What are the exact FOA Titles: 👑 Arena Grandmaster (AGM) — Rating 2000; the player must maintain the rating at or above 2000 for 50 games for Rapid time control or 100 games for Blitz or 150 games for Bullet to qualify for the online title. 👑 Arena International Master (AIM) — Rating 1700; the player must maintain the rating at or above 1700 for 50 games for Rapid time control or 100 games for Blitz or 150 games for Bullet to qualify for the online title. 👑 Arena FIDE Master (AFM) — Rating 1400; the player must maintain the rating at or above 1400 for 50 games for Rapid time control or 100 games for Blitz or 150 games for Bullet to qualify for the online title. 👑 Arena Candidate Master (ACM) — Rating 1100; the player must maintain the rating at or above 1100 for 50 games for Rapid time control or 100 games for Blitz or 150 games for Bullet to qualify for the online title.
Thats on the FOA website, not sure if this helps, I'm looking into as well.