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Wildebeest - A cloudflare based Fediverse server
(github.com)
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
Likely Hetzner, Netcup and OVH. Large relatively cheap VPS providers in Europe.
I remember reading an article some time ago about someone actually investigating that and there was also some large US hoster in the mix. but those few made up 80-90% of the fediverse instances.
Edit: found it: https://bitkeks.eu/blog/2020/03/underlying-problem-fediverse-decentralised-platforms.html
ah, i misread your initial post. i thought you meant half of all users were hosted by a few instances. thanks for that article!