I think it would be really cool if someone built a reverse proxy just for dealing with these bad actors.

I would really like to easily serve some markov chain non-sense to Ai bots.

perhaps Iocaine [1] is what you're looking for. See the demo page [2] for what it serves to AI crawlers.

1. https://iocaine.madhouse-project.org/

2. https://poison.madhouse-project.org/