Blockchain is used in more places than you'd expect... not the P2P version, or the "cryptocurrency" version, just the "signature based chained list" one. For example, all signed Git commits, form a blockchain.
The Metaverse has been bubbling on and off for the last 30 years or so, each iteration it gets slightly better... but it keeps failing at the same points (I think I wrote about it 20+ years ago, with points which are still valid).
Web 3.0, not to be confused with Web3, is the Semantic Web, in the works for the last 20+ years. Web3 is a cool idea for a post-scarcity world, pretty useless right now.
Dot.com was the original Web bubble... and here we are, on the Web, post-bubble.