This is becoming less true for FPS every month - the described method of cheating (off-device reading and input simulation) is becoming more accessible as more cheat makers are selling premade devices that do this. Huge problem even for new shooters like rivals - someone was already caught doing it in one of their ingame tournaments. It's the primary way people cheat in League of Legends, and it would not surprise me to see evidence of it in dota 2(though I haven't personally, I haven't been paying attention to it for some years and it isn't as frequent that a variety streamer or youtuber plays it compared to lol).

As mentioned before, kernel anticheat won't catch these guys anyway, so it's largely just a way to alienate your user base. There's a new problem it does nothing special to solve.