I think it is too harsh to say all of cyrpto is a scam.
Certainly there are plenty of scams out there, and equally there are plenty of legitimate projects that have no real use case and don't offer anything new.

But it is also the case that there is some good stuff out there. Bitcoin for a start. Similarly it would be difficult to argue that Ethereum is a scam - there is a lot of interesting functionality there which is not present in BTC - smart contracts have a real solid use-case. Same for XRP, definite use-case in international banking, which can't be filled by BTC.

So some are scams, a lot are pointless, and a smaller amount are genuinely great projects with talented developers, well-thought-out road-maps, rock-solid real-world use-cases.

(That may be my personal record for consecutive hyphens.)