It is about secure boot and TPM. Linux is unable to 'lie' well enough to emulate windows because it can't cryptographically verify that it is a legit windows in

It is about secure boot and TPM. Linux is unable to 'lie' well enough to emulate windows because it can't cryptographically verify that it is a legit windows install. The anti cheat developers rely on Microsoft asserting that other cheats aren't loaded prior to the anti-cheat in the kernel. There is no such entity in Linux to attest that a particular linux install is not modified to load the cheats into the kernel before the anti-cheat. Now, such an entity could be created, and a linux distro released that is signed by that entity, and then the anti-cheat could work on that distro. That would require you to only use that particular distro, though, and you would be limited in how you could change the kernel. So far, there has not been the push needed to make that happen.