If you feeli that another member is using disallowed resources you should report them directly, not post in the forums.
https://support.chess.com/en/articles/8562517-how-do-i-report-someone
Cheater report
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Hello,
I want to report this player -> [removed, public accusations are not allowed -- MS]
Yesterday I play him twice, first game was normal with his 76% acc, in second game I was totally destroyed and opponent had 99.9% acc.
This player has more games like that:
[removed]
Propably in some games he is using engine. Please check it.