For the record: I personally think that Bitcoin is the only part of crypto which is partially useful. Of course it is mostly used for empty speculation and buying drugs, but there are transfer and legitimate payment sides of it. Too bad its cost for the humanity is disproportional.

Ethereum network is a nice exercise in distributed computing, but its usefulness is questionable, while harm is undeniable.

Everything else crypto are either scam (I estimate this at 90%) or solutions in search of problems.