IE: Quakebots and Fighting games have perfect reaction times and perfect combos. They can simply block perfectly and counter attack perfectly and never drop a combo.
You act like cheating is new to video games??
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We never wanted bot in these games. Still don't want them today, and it's a big reason that playing on public boxes (ex: at an arcade or eSports tournament) is still a thing.
Defeating an opponent in a tournament is a big thing for fighting games. The risk of cheating online is always there so online tournaments are simply never taken as seriously (ie: as much $$$$ risked as real life tournaments).