Microsoft has long wanted to get vendors out of the kernel. It’s a huge privacy/security/stability risk, and causes major issues like the Crowdstrike outage.
Most of those issues also apply to kernel anti-cheat as well, and it’s likely that Microsoft will also attempt to move anti-cheat vendors out of kernel space. The biggest gaming issues with steamOS/Linux are kernel anti-cheat not working, so this could be huge for having full compatibility of multiplayer games on Linux.
A secondary device can’t be identified by kernel level anti-cheat either. If you have a standalone device that identifies as a USB keyboard and mouse and then generates inputs that give you a 100% headshot count, there’s nothing you could detect through the kernel, since all it detects are keystrokes and clicks.