Really.... no one. .... wow
Opponents using AI

I heard from another chess website that 95% of cheating reports are entirely poor loser rather than actual cheaters. Even still, if you think an opponent is cheating, report them and move on.
Cheating is, unfortunately, a reality of any online play. If you choose to play online, your opponents could possibly be cheaters. But spending time thinking about it is just wasted time. Report and move on.

https://support.chess.com/article/648-what-do-i-need-to-know-about-fair-play-on-chess-com
https://www.chess.com/article/view/online-chess-cheating
Discussions of cheating, potential cheating, or cheat detection are not allowed in the general forums. If you want to discuss, join the following club.
https://www.chess.com/club/cheating-forum
Can anyone else just feel the difference in opponent strength when they are using an engine? I know it happens. I’ve played enough to know what to expect from a opponents rating and I know sometimes your opponent is on their A game and just play tough., but I’ve also played games Where opponent seems to morph into Superman n the middle of a game when they r behind. I think I’ve played enough chess to suspect when I may b being cheated. Can anyone else tell it when your opponent engines up??