It should be noted that, at least for now, account migration can only go one way. That is, from the main Bluesky PDS to an external one. According to the documentation on account migration[0], they plan to enable incoming migrations at some point in the future, but there's no timeline.
I'm sure a big reason for this the possibility for abuse, since "migrating" an account is a different action than simply "creating" a new one
Similarly, I've used a project called nixos-infect(1) to install NixOS on cloud providers that don't natively offer it. It's worked well on the handful of boxes I've ran it on.
It's not very prominent, but the Android mobile app does have the option to change what server you register on.
https://ibb.co/s9pzTt3k
You can tap on the bold "Bluesky Social" text to change it.
> And there is no single one alternative server where we can register and interact with people on bsky.app
You absolutely can host a PDS that interacts flawlessly with the rest of the network. I host my own. There's an entire section in the README about self-hosting: https://github.com/bluesky-social/pds?tab=readme-ov-file#sel...