If it's on Linux then it wasn't kernel-level anti-cheat, and therefore mostly useless. It's not surprising that it did nothing to slow down cheating. Even KLAC can be circumvented. It increases friction and cost for cheaters but it doesn't solve the issue completely.

Ideally you would be free to not play KLAC games, and I would be free to play KLAC games. I just hope for the option one day, as I would very much like to make the move to Linux.