Microsoft has officially announced its intent to move security measures out of the kernel, following the Crowdstrike disaster a few short months ago. The removal of kernel access for security solutions would likely revolutionise running Windows games on the Steam Deck and other Linux systems.
The anti-tampering solution sounds like some trusted computing bullshit like on mobile where banking apps will refuse to run if your device has a custom rom or non-locked boot loader. This would be how anti-cheat software could continue to lock out linux.
I bet it is similar to android “mimimi this is sideloaded version, I will not start that, download original version from play (bzw. MS store) store plz” feature
Effects that anti cheat software games only can be sold via MS store, great! /s