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It's also fully open source and you can self-host your data while interacting with everyone else like it's GitHub

Until they rugpull, like many VC backed OSS projects over the years, I imagine.

How would they rugpull your own self hosted infra ?

And the server architecture that runs on ATProto ? (And so your own server and bluesky's servers and Blacksky's servers and so on).

You can self host every part of ATProto with relative difficulty (PDS, where your data is, is the easiest)