I think most people concerns about crypto is either the scam (of other people) or the potential displacement of the system they are part of (which will cause its fall and a loss to them/it's a zero-sum game). Both of these are valid concerns.

What I am wondering, however, is if this scamming/pumping money will eventually make a legitimate industry. Many industries/technologies have started out of that (Military, Gambling, Sex, etc...)