I hate the "own your data" meme in the decentralized social web. A friend of mine pointed out how useless the phrase is a few years ago and I agree. "Ownership" sounds an awful lot like digital "property", which is nonsense when moving from physical to digital stuff because copying doesn't destroy the original. The path you go down there is the path to artificial constraints like DRM. Yikes!
We should be talking about user autonomy instead. That's a much better meme.