There was a huge furore about someone I'd met up with several times
But that could also happen with meeting people in the PTA or WI or at the swimming pool. However you meet people, you learn to trust them or not, and sometimes we will get it wrong. I don't think the format changes that, and you have to keep your wits about you anyway.
OTOH, even if there was some way of guaranteeing absolutely everyone was totally reliable in all ways, there would still be some who would choose not to meet, which is fine.
But in modern society, we tend to meet a far wider range of people for all sorts of reasons, so you can't expect to be able to check with Aunt Nora's colleague's next neighbour's mate who used to play darts with the person you just met, that they're okay (well, you probably still can in the village my sister lives in...) And people have found friends who turn out to be false, liars, scammers and so on, throughout history, so for me, the method of meeting doesn't change that. But we do have to meet people somehow, else it's a very lonely life ahead, and there are good people well as bad out there, so it's just a personal choice about where you take your risks.