Web 3.0 is more than trading (arguably speculative) coins.

Nader Dabit has done an excellent job describing the use cases: https://www.freecodecamp.org/news/what-is-web3/

That reads like fairytales and wishful thinking which entirely ignores the substantial corruption and manipulation of the 'crypto economy' that exists now.

Everything mentioned int it can be done right now without crypto, it's called FOSS, and people have worked out how to monetise their ideas while keeping them open and reusable.

you dont need a currency, its just another product of byzantine fault tolerant systems. Decentralisation has many products, currency is one of them.