proprietary games that install rootkits(wrongly called anticheats) on the system. the corporations in charge have brainwashed masses into thinking that it’s just a benign thing there to fend off “cheaters”, conveniently brushing aside the fact that this is a massive and lucrative attack vector. it only helps bad actors(including three letter agencies).
and this is not a what-if scenario. every year you can find an incident where such a “solution” is exploited.