The way I understand it is that every anticheat needs to be overhauled as they can no longer tap into the kernel/get kernel access. So the anticheat has to run in userspace. This can also be done under GNU/Linux which is why anticheat should work on both platforms.

It seems quite likely actually. The only problem might be them noticing the benefit for GNU/Linux.

They want to prevent spooky programs running in the kernel (like crowdstrike) which may break the whole system. Source: https://www.theverge.com/2024/7/26/24206719/microsoft-windows-changes-crowdstrike-kernel-driver

Due to planned virtualisation in Windows this will probably soon be the case for people who Dual boot due to anticheat.