Activitypub does have many very small nodes, very few very large nodes, and few medium sized ones. A lot of this is people wanting to be on the same server that their friends are on (even if there aren't that many advantages to it), and just that structurally, running a largeish server is more cost- and time-effective per user.
It'll be interesting to (if that ever happens) see whether bluesky, once it actually becomes a decentralized system instead of a closed one, shakes out differently due to protocol differences, or broadly follows the same patterns.
It is also at the same time contrary to everything he‘s said before about how he would run twitter - hell, he called this account out specifically as one he would not ban because he is oh so committed to free speech.
It will also not be enforced against anyone except if you‘re sharing the location of Elon, of a billionaire buddy of his, or kick up enough of a stink that it‘s a PR issue.
The person doing the cleaning on our office floor always wears very large and conspicuous probably noise canceling headphones, while working. Guessing she has had one too many person trying to make awkward conversation while she was just trying to get the coffee cups in the wash as quickly as possible.
It'll be interesting to (if that ever happens) see whether bluesky, once it actually becomes a decentralized system instead of a closed one, shakes out differently due to protocol differences, or broadly follows the same patterns.