@thomasfuchs I also feel like it would be easier (for getting people on board) if Google and Apple were to make their own instances in the same way that they have with Email, As much as I disagree with it, I've noticed that alot of people will be fairly afraid of new tech unless it has a massive corporate backing.
@thomasfuchs at most if you were to be an absolutist about everyone being on different instances you could have a random lottery where they are given a random instance chosen from a short list of the most reputable instances, (and then hide that from the user to avoid confusion) although the simpler option of just defaulting to a single instance is probably easier and better for getting people on board