How to detect the cheaters?
https://support.chess.com/article/648-what-do-i-need-to-know-about-fair-play-on-chess-com
If you feel any opponent is using disallowed resources you should report them. https://support.chess.com/article/209-how-do-i-report-someone
Otherwise, discussions of cheating, potential cheating, or cheat detection are not allowed in the general forums.