Comment by xboxnolifes

The competitive CS leagues do use AC though. The big issue for these games is the free-to-play model does not work without anti-cheat. Having a ~$20 fee to cheat for a while before getting banned significantly reduces the number of cheaters, and that's what CS does with their prime server model.

And for what it's worth, I'm pretty sure Valorant is the most played competitive shooter at the moment.