As briefly as possible:
If you read the spec, Relays jump out. There's a reason why there's only one and it's under the control of Bluesky.
did:plc (the usernames directory) jumps out. There's only one and it's under the control of Bluesky.
Appviews jump out. There's only one and... you get the idea.
*Lots* of people are looking at all this right now. If it were possible to run these things themselves, they'd be doing it for fun/interest. But it isn't.