With proof of what was promised for the money being given over...that would probably seal it up pretty good. There's various ways to try to weasel out of things in court, but there'd be a good basis for some kind of fraud really.
I remember that couple and the homeless guy who ran that gofundme scam...where the money was supposed to go to him over a phony feel good story but instead all 3 split it up. The scam unraveled when the homeless dude felt he wasn't getting enough dough from them and so sued them for it, which made for an investigation.
Go Gund Me has some stricter rules though. I'm not sure if Twitch donations, or whatever service he used to collect them, is as stringent. I think there definitely is a case to be made for fraud, I'm just not sure how actually strong a case it would be.
Also as an aside, I remember I had a friend whose politics took a real hard libertarian turn after his daughter was born, likely due to extreme sleep deprivation. Anyways, when that story about the pretty blond lady being helped by the homeless man and then starting the Go Fund Me page first came out, he was all over that story talking about how it proved that we don't need government to provide aid to people, that instead we can handle all of those things similar to how those people did it. Man that was hilarious watching that story blow up in his face.