Essentially, they same way they catch anyone. That said, if you would like to discuss detection then join the following group: https://www.chess.com/groups/home/cheating-forum
Question about the Chess.com computers
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How do the Chess.com computers (in Live Chess) know if you are cheating and using another computer engine to help you? Becasue in Computer4-IMPOSSIBLE's profile, it wrote that if you use an engine or another computer to help you win, it will restrict your account. But just how does it know?
Disclaimer: I don't cheat.