Why do they care if it does? Creators get paid on a per-gold basis, which means people are paying reddit in the first place for gold. Whether bought gold is spent on bots or human users is probably entirely immaterial to the Admins. Reddit sees engagement and (ideally) spending go up.

Reddit could crack down on bots if they want to. It’s almost entirely a separate issue. Adding money likely isn’t going to change much since obviously bot farms already have a profit motive to spam reddit and the payouts aren’t huge.