The rule "make 15 quality post" are not really followed up by bounties organisers so many a time post that really has zero credibility are posted just in the aim of have a post count by the bounty are poured in on this platform.
There by causing the community to pay the price of the excesses of bounty campaign
But if this bounty project organisers can adequately check the post and give a pass to a good post and a fail if possible a sanction to spam post. I fill it would go along way in getting rid of unwanted post
Well, there's a way to eliminate that problem, for example:
1. Talk to the bounty manager of that campaign and ask him to make a due diligence of ensuring all participants are abiding on the rules that's been set.
2. If he doesn't replies and not making any sort of act to end it hence he just doing it again not to eliminate shitpost on his campaign, then open a thread on Reputation section to discuss the issue of that bounty manager and his campaign. In that if he found guilty we have successfully end a one campaign that promotes shitposts.
3. Always be vigilant to provide some evidence as always so you can defend what you indeed found on that campaign or what the bounty manager is doing not eliminating some shitpost or not abiding on the rules he set.