AI could probably find the occasional actual bug. If you use AI to file 500 bug reports in the time it may take a researcher to find and report 1, and only 2 pay out, you've still gotten ahead.

But in the process, you've wasted tons of time for the developers who have to actually sort through, read the reports, and verify the validity of the issue. I think that's part of the problem. Even if it sometimes finds a legitimate issue, these people are trying to make it someone else's problem to do the real work.