Kernel anti-cheat systems are currently the bane of Linux/Steam Deck gaming, haven’t actually proven to be effective at stopping cheaters (see Valorant for an example), and lead to various security concerns from giving 3rd parties full access to your machine to being used to install ransomware and malware.
Windows tried to restrict kernel access years ago, but backed down under pressure from various companies. However Crowdstrike’s outages have shown the sever consequences of leaving kernel access open, and we might finally see kernel access to be cut off.
This is what OP said, and it’s completely correct. It’s not that much impact in comparison to “regular” anti cheat systems. And both of those only detect either cheap/bad or known hacks.
Server-sided and data based anti cheats is what would actually be a huge step up. You’re running a 8 K/D in a game where the best players are between 1-2? Banned. You just flicked two enemies within 100ms? Banned. Suspicious activity that’s not that blatant needs to be reviewed.
The thing is - that’s fucking expensive, complicated and needs to be done one a per-game basis, and since its just cheaper to throw you under the bus with a kernel anticheat and claim it’s the best one, that’s being done.
Read up on the dangers.