Hive is still working on that first million :) All these recent platforms got massive hype that brought people in. Network effects are powerful.

BTW is worth about a trillion right now, but that is mostly down to investment markets. The value of the web is largely driven by advertising and I would think that market has limits. So I wonder what your prediction for Web3.0 is based on. In the end people need to be spending money on something to generate value. I'm no economist though.