if you have a large enough player base to sample, you can determine who is cheating with math. EA Fairplay is pretty good.. Steam's VAC is good, and not some kernel level nonsense..
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VAC is absolutely terrible, are you kidding? You have to rage to get VAC banned.
False positives with no process for recourse and nice perfect fingerprinting to prevent ban evasion is better?
I think they intentionally have the knob turned all the way up to 0.1 initially, for PR and lube reasons.
To some degree, yes. But there are actually many cheaters that intentionally don't play perfectly to avoid detection. That way they appear higher skilled but still within human range.