...either you don't care enough about this forum and the campaign to just read the OP from time time. Or you're a robot.
My gentle suggestions:
1. Keep your threads self-moderated.
2. Clean up nonsense posts.
3. Clean up bounty updates once the campaign is over.
4. Close the thread as soon as all bounties have been distributed.
It is interesting to know who actually posts these nonsense posts. If the bounty managers simply want to promote their post by allowing shitposting, you cannot do anything about it. I mean even if you remove the post, the topic moves to the top of the thread anyway right?
Also, I think deleting these posts won't help, you have to block the user, at least for a period of time.
Closing the thread after they are done with their bounty is something that I can get on board with.
Also, on a completely unrelated topic,
If someone knows how a bot can take care of bounty reporting please send me a dm.