Luckily Valve seems to believe in freedom of decision for their users so they won't do this. There are kernel level cheats so there are kernel level anticheats. Obviously anticheats are mostly lame in what they do so it would probably be better for them to not be kernel level. Still there are "pure malware" anticheats and Valve thinks it's up to the user to decide if they want one, their job is to inform the user. And that's the best approach here in my opinion.