I agree about the abuse, and the OP is probably a good example of that. Do you have any ideas on how to curtail abuse?
Ideas I often hear usually assume it is easy to discern AI content from human, which is wrong, especially at scale. Either that, or they involve some form of extreme censorship.
Microtransactions might work by making it expensive run bots while costing human users very little. I'm not sure this is practical either though, and has plenty of downsides as well.