That's easy to say. But they do prevent some cheating. Don't believe me? Consider the simplest case: No anti-cheat whatsoever. You can just hook into the rendering engine and draw walls at 50% transparency. That's the worst case. Now, we add minimal anti-cheat that convolutes the binary with lots of extra jumps and loops at runtime. Now, someone needs to spend time figuring out the pattern. That effort isn't free. Now, people have to pay for cheats. Guess what? Visa doesn't want to handle payment processing for your hacks & cheats business. So now you're using sketchy payment processors based out of a third-world country. Guess what else? People will create fake hacks & cheats websites that use those same payment processors, and will just take people's money and never deliver the cheats. You get to try to differentiate yourself from literal scammers, how are you going to do that? You can't put the Visa logo on your website. Because you're legit, and you don't want to get sued. Then, the anti-cheat adds heuristic detection for cheat processes. The anti-cheat company BUYS the cheats and reverse-engineers them and improves the heuristics. then the game company makes everyone sign up with a phone number, and permabans that phone number when they're caught cheating. Now some gamers don't want to risk getting banned. Saying that these factors simply don't exist or are insignificant is certainly one of the opinions of all time.