They’re pretty entertaining however one issue is, since they’re amateurs and not law enforcement officers, they often make procedural hiccups that would prevent any proof or evidence they collect from these encounters with predators from being used in court. There’s been a few high profile Internet “celebrities” who got exposed by one of these guys, but because of some fuck ups on the end of the predator hunter, the perp was allowed to get off scot free because the state couldn’t use the evidence collected. It would be better if they worked with law enforcement more often, but a lot of them might lack the patience or interest in doing that, since they can do it in a more sensational manner.
As Dan Lanning would say, they do it for clicks while law enforcement does it for wins (in court).