They're sort of gone. I say sort of because you can still challenge them if you know their names. I use my archive and just click on one from a previous game and challenge/rematch them. Doesn't help you much though does it? You might be able to "custom challenge" one in live although I haven't tried it yet. That's probably your best bet though...
where are the rated bots?

Tim
https://support.chess.com/article/1044-how-can-i-play-the-rated-bots-in-live-chess

@notmtwain:
Alas, that article is outdated. Live > Play computer doesn't work any more; it just takes you to the unrated Play computer. Hence my suggestion for workarounds...

@Martin-Bot
@Filip-Bot
@Wayne-Bot
@Milica-Bot
@Fabian-Bot
@Juan-Bot
@Noel-Bot
@Oliver-Bot
@Mina-Bot
@Janjay-Bot
@Zara-Bot
@Santiago-Bot
@Karim-Bot

@Emir-Bot
@Sven-Bot
@Junior-Bot
@Maxim-Bot
@Hans-Bot
@Azeez-Bot
@Laura-Bot
@Maria-Bot
@Elena-Bot
@Wilson-Bot
@Jade-Bot
@Vinh-Bot
@David-Bot
@Ali-Bot
@Mateo-Bot

@Antonio-Bot
@Wendy-Bot
@Pierre-Bot
@Pablo-Bot
@Joel-Bot
@Isabel-Bot
@Arthur-Bot
@Isla-Bot
@Jonas-Bot
@Lorenzo-Bot
@Wally-Bot
@Julia-Bot
@MIguel-Bot
@Xavier-Bot
@Li-Bot
@Olga-Bot
@Charles-Bot
@Fatima-Bot
@Manuel-Bot
@Oscar-Bot

@Noam-Bot
@Nora-Bot
@Ahmed-Bot
@Sakura-Bot
@Arjun-Bot
@Francis-Bot
@Sofia-Bot
@Alexander-Bot
@Luke-Bot
@Wei-Bot
@Danny-Bot
@Hikaru-Bot

Thanks for the lists of bots! I was trying to figure this out yesterday. I hope they bring back rated vs bot properly at some point, but until then this is great.

@komodo1
@komodo2
@komodo3
@komodo4
@komodo5
@komodo6
@komodo7
@komodo8
@komodo9
@komodo10
@komodo11
@komodo12
@komodo13
@komodo14
@komodo15
@komodo16
@komodo17
@komodo18
@komodo19
@komodo20
@komodo21
@komodo22
@komodo23
@komodo24
@komodo25 (This bot was a new release. it is not playable)
Tim