Actually its possible. B.C each Created Character has a world standing with detailed stats. They can see everything, but I doubt they reset anything. In fear of them screwing something else up
This assumes that R* can evaluate every single player and make a judgement call on each of them. Not saying it's impossible, but I am skeptical as to what technology they do have.
You didn't read closely. They cannot evaluate every single player. Most players are not on the extreme ends, but have still farmed. How much farming should get you banned? It honestly should be all or nothing, and there is really no way to evaluate that.
As I hinted before, I don't think they can evaluate every single person fairly.