I imagine it's similar to the logic behind locks on houses. Thieves still exist, but by making it harder for them, you reduce the chances of them targeting your house. You won't ever reduce that chance to zero, but you can reduce it significantly.
Similarly, I imagine the more effort you have to put in to get through anti-cheat software, the more likely you are you give up and play a different game. There'll still be some people determined enough to bypass it, but that number will be smaller than it would be otherwise.
Fwiw, I don't play these sorts of games, so I have no idea if this stuff is effective, but there's a comment somewhere in this thread saying that Valorant has fewer cheaters than other, similar games, in no small part due to their aggressive anti-cheating measures, so anecdotally it may well have an effect.
Similarly, I imagine the more effort you have to put in to get through anti-cheat software, the more likely you are you give up and play a different game. There'll still be some people determined enough to bypass it, but that number will be smaller than it would be otherwise.
Fwiw, I don't play these sorts of games, so I have no idea if this stuff is effective, but there's a comment somewhere in this thread saying that Valorant has fewer cheaters than other, similar games, in no small part due to their aggressive anti-cheating measures, so anecdotally it may well have an effect.