Gebeurt te weinig tegen is mijn idee.
If you feel that any of your opponent's are using disallowed resources, you should report them.
https://support.chess.com/article/648-what-do-i-need-to-know-about-fair-play-on-chess-com
https://support.chess.com/article/209-how-do-i-report-someone
That said, discussions about cheating, potential cheating or cheat detection are not allowed in the main forums. For that join the following club: https://www.chess.com/club/cheating-forum
Gebeurt te weinig tegen is mijn idee.