Earlier quoted context omitted.
Like perpetual motion machines, some are scams and some are just run by sincere fools. And it's entirely possible that there are some real businesses run by smart people who needed funding and the blockchain bits are just window dressing. So not scams, exactly, but more the kind of marketing fraud that, in the marketing world, barely counts as fraud at all. If you have proof that one of them is a) a real business, b)…
The only proven use of blockchain is to transfer value from one person to another over the internet without relying on a central bank account. Doesn’t that validate the tech to some degree?
I'll grant Bitcoin has some utility for light crime, like buying drugs or evading capital controls. And it's the technology of choice for ransomware and some kinds of electronic fraud. (It's bad for serious crime as it leaves too much of an audit trail.) But I don't think crime is a very good domain for running real businesses, so that doesn't count for me either.