I'm not sure how effective this will be. A lot of AI-generated bug bounty reports are pure spam, but a significant fraction are well-meaning humans who genuinely believe the nonsense an LLM has given them. The former category do not read the rules in the first place and will not be deterred - spray and pray is their MO. The second category will not believe that any "no slop" rules apply to them, because they genuinely think their bug is real.