Chess.com does not allow cheating in any form, including in chess variants. However, detecting and cheating in variants like 4-player chess or Crazyhouse can be more difficult because these games have different rules and mechanics compared to standard chess, And a normal anti-cheat won't work with variants, It would be hard and expensive to make a new, efficient anti-cheat for every variant game.
Why chess com allows cheating in chess variants ????
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About the "Blocked users are still paired for a game", I think it might be a good suggestion to enhance the user's experience if staff added it.
Why chess com allows free and unpunished cheating in KOTH or 3+ ?
Moreover blocked users are still paired for a game, that's ridicilous. I reported that as a bug, but most probably because I am a free user no body pays attention to my report.