All the concerns about umbrel being all proprietary are really about continuity and interoperability. We want a personal cloud where we can maintain continuity, and it needs to be, well, in some cloud that isn't your home, but also it needs to be replicated to your home (because again, continuity). Continuity in the face of:

- switching providers

- providers going bankrupt or being acquired by others who don't care

- account lockouts!

- switching device OSes

Open source means continuity and interoperability. Proprietary means the opposite.