I've thought of a comprehensive and near perfect 99% cheat-proof system (it may be used already but I've never heard of it), it requires reporting and requires a "Report ELO", it requires very little dev work on the side of removing cheaters manually, and rewards obviously legitimate players, and punishes the suspicious players who hide it well, and heavily punishes and almost eliminates blatant cheaters. The system works by having a report function that is very rarely moderated by a person