Could you just match-up players to similarly skilled opponents?

I'm not a player, but I assume people access Dota using the same account each time they play? Their win/loss record should produce a decent "skill" ranking. Those that are cheating will un/naturally do better, and eventually they'll just be playing each other.

It would be sort of like a shadow-banning. They still get to play, but real people don't have to come in contact with them.

Who cares if the cheaters play other cheaters? Perhaps it's a drain on the company resources? But if they're paying participants, does it matter?