I agree for the most part, there are other ways, like a phone number, manual verification with a photo, require players to play 10hr before they can play competitive, have a recommendation from other players, etc, or even a pay-once 5 dollars game pass on top of all those things.

Although I recommend you to watch the valve presentation of AI anti cheat if you did not already. Their work is quite interesting, and they claim they catch 99% of cheaters.

Although obviously there are also very subtle ways to cheat, too.