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.
I’m not sure this will be an issue.
When a piece of software is checking for chain of trust, it’s done primarily for security or DRM reasons. The benefits of verifying this chain of trust would make it a little harder for cheaters to inject code and it would be an extra hurdle for pirates to overcome, but the cost is that everyone that bought your game with the intent of playing it on Linux now has absolutely no way to make that happen. I’m not sure the loss in ~4% of your sales would be worth the benefit.