The original prediction markets were internal things at large companies, which I think are a great idea. I've flirted for a long time with doing a vulnerability prediction market. The good-faith incarnations of prediction markets aren't open to all comers; they're structured so you can't meaningfully gamble on them.
Yeah, sorry for not being clear enough. I just struggle how a good faith market can even exist. I immediately start thinking how participants would be incentivized to cheat by neglecting or even introducing vulnerabilities to win. Maybe I’m just a bit too cynical and/or should do more reading on the topic.