Are they? Cheats for games like Fortnite, CS (Faceit), Rust, LoL have become very expensive (100 USD per month are not unheard of) or require you to purchase special hardware.

And I have yet to come across an anti cheat driver of the big publishers (EAC, Faceit, Javelin, Vanguard) being exploited and allow access to r/w kernel memory. It is more likely that the driver of some hardware is being exploited for, rather than anti cheat drivers.

Personally, I only remember the ac driver of Capcom ever being exploited. Compare this to the dozen hardware/av drivers which were exploitable, like the Intel LAN utility driver, ASUS IOMap64, MSI NTIOLIB or that one Razer driver. Oh, and CPU-Z and the Avast Hypervisor driver were exploitable too and allowed r/w on kernel memory. These drivers are way more likely to be weaponized than ac drivers.