It is nothing but a marketing term at this point. Various groups are trying to claim it and normalize their own meaning, but there is little consensus whether it even has a shared meaning.
Most revolutionary/generational tech has started with an implementation or at least a proof of concept of something new and novel that subsequently drove interest in how it worked. Like Google Maps use of AJAX for infinite scrolling or Napster and peer to peer networks, or even Bitcoin and blockchain. I’m not aware of any such example for Web3.
I believe edge computing is one of the game changing technologies for the decade. I am not sure if it can fall under the purview of Web 3 or not. For example one of the library I implemented was along training ML models on user devices instead of the cloud maintaining privacy and personalization.
Decentralized identity. Having an on chain address, and its holdings as your username + public assets. It's past proof of concept. It has not propagated to become commonly accepted yet.
How do I own? I mean I realise I can buy NFTs which I guess are "web3" but then I can buy a bunch of stuff on the normal web including stock in facebook etc.
buying a stock on web2 vs web3 gives interesting properties because of ownership.
for ex: take an instant USD loan on your stock, since you are the owner only your authority(signature) is needed. In web2 world you go through middlemen.
I do care if that data gets leaked or if that data is used by third party companies for things I have bought and I do not want them to know. Why should a bank do my credit scoring based on my what am watching on Amazon or what books am I reading
That doesn't mean it isn't something new and useful though, just like web 2 was.