Valve tries to make it easy to run a proton-compatible anti-cheat system which I believe is built in to steam libraries, but developers still have to choose to

Valve tries to make it easy to run a proton-compatible anti-cheat system which I believe is built in to steam libraries, but developers still have to choose to use it notably Microsoft seemed totally uninterested in using a proton compatible EAC for Halo Master Chief Collection last time I checked earlier this year. I read online it should have been easy to switch to the proton compatible EAC but some devs might not want to.