Most personal computers aren’t running a node,

[professor rat]

“Web 3″ is a decentralized internet backed by blockchains and cryptocurrencies. If “Web 2″ is the internet as we know it today, where companies like Amazon Web Services, Google and Microsoft provide the back-end tools for users to make their own websites (i.e. cloud computing structures and rentable servers), then “Web 3″ should be an internet built on public blockchains, without centralized corporate mediators.

https://www.coindesk.com/layer2/2022/01/10/is-moxie-marlinspike-right-about-web-3/