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62% of Funded Blockchain and Web3 Companies Attract Fewer Than 100 Monthly Organic Visitors
(guerrillabuzz.com)
This is a most excellent place for technology news and articles.
A website is web3 if it's enabled to handle crypto(s) and usually crypto contracts.
From the Wikipedia entry:
I don’t want financial assets to be created from almost everything I do online!
So it’s not an official standard. It’s a buzz phrase used by people who wanted to make others think “crypto was next gen”