My lab has been trying to get sharing, searching, and crowdsourcing to scale towards millions for 16 years now.
The fundamental science is making progress to re-decentralise The Internet. Decades of work left obviously. Lots of progress on creating non-profit versions of all of Big Tech services (well in principle that is). Even Amazon can be decentralised, see a recent phd thesis from the lab, https://repository.tudelft.nl/islandora/object/uuid%3Aa4f750...
European Commission might come in and allow open source clients of Facebook, instagram, Twitter, Amazon, etc. Our trustchain technology is specifically designed to be the superstructure for this. So EU might break down the defensive moats around 10 T$ of market cap. The legal foundation is already there, the new eIDAS Regulation is designed to _enforce_ login using the upcoming EU digital passport for all of Big Tech. So Open Source EU Metaverse, connecting all Big Tech protocols into a single repo and identity management solution with true privacy protection..