Technically an app was not supposed to change under me after it was installed on my device and we live in a dystopic world if that happens, but sure, yes, I get your point.

I suppose "an app per creator" would be just some creator adding some branding and distribution to an open-source codebase such that they have control over auto-updates for their community? Update lovers everywhere will complain that this creator will either have to comply with upstream updates that may damage the experience he initially wanted for the app or they will have to fork the base open-source codebase, which he will be unable to, or he will have to never update again, which is a sin. I am happy with any of the three options, though.