Atproto is not decentralised, it’s faux decentralised. You can technically be sovereign, but incentives and the way things have been done results in massive centralisation - 99.9% of users are on a Bluesky PDS and have not registered a higher priority rotation key. And they won’t, ever, because that’s how humans work.
The day Bluesky decides to enshittify there’s a very real possibility that they might also just stop allowing people to extract their keys and splinter off the network. The enshitification begins when VCs turn upp the heat it they start getting low on cash.