Unbreakable DRM for software, such as for your $80 billion game business or your subscription office suite.
As a bonus, it prevents those pesky Windows API compatibility tools like Wine from working if the application is designed to expect signed and trusted Windows.
it will never be unbreakable, and only needs to be broken once
intel can't even get SGX to work
The mass exodus to Linux gaming is already causing a push back against kernel level anti-cheat.
People who 5 years ago didn't give a hoot about computing outside of running steam games are now actively discussing their favorite Linux distro and giving advice to friends and family about how to make the jump.