Only thing I'd add is that I'm running this experience on my desktop (expressed in different words, though mobile may want to be extreme about it). And there the data providers are an extra layer behind the apps (libfolks, libevolution, the filesystem, etc), and given the common base I'd suspect Purism will end up doing the same.
Mastodon.ART — Follow friends and discover new ones. Publish anything you want & not just art of all types: links, pictures, text, video. All on a platform that is community-owned and ad-free.