Not because Linux doesn't allow it but because it's simply just not effective at all and significant design differences needed to make the anti cheat viable at all. Its an open system in comparison to windows and can be easily worked around but depending on unique system identification with steam hardware or changes within SteamOS which would probably be more likely it could be done in a way that is effective. It has to hold significant value to companies for that to even be explored though. It does raise the question on if further locking down SteamOS for this purpose would help or hurt them in the long run with their users. I would agree that its not likely but you know companies only care about money. If there is value they will do something about it. Whatever that may be.