Always a confusing and not very useful terminology.
(Too many people wanted to claim that their thing is Web3.0)
VenkateshRaoOnMetaVerse has some good points. He thinks of web3.0 as very much focused on the blockchain / CryptoWallets address as the id of every "person" and NonFungibleTokens as the id of THINGS. But web3.0 is tied to data stored on IPFS and similar. So largely content addressable.
So content addressable data + NFTs / blockchain based "ownership" (and "authorship") credentials.
Here's some scepticism, I agree with. Which has a very good analysis of WebTwoPointZero
Just a conceit for some interesting articles by PhilWaineright on API driven applications. Read with WebServices, WebTwoPointZero (obviously) and the PlatformWars blog] http://platformwars.blogspot.com blog]
Timely since there's a new wave of opening up APIs (Alexa, DaveWiner trying to get people to clone the Google API, etc)