Isn’t diaspora like that? They have a somewhat facebook-like interface and rely on ‘aspects’ to define how public or private something is. It is listed on the fediverse map, though it doesn’t use activitypub but a different protocol.
Yes it’s a fediverse platform mainly focused on sharing pictures.
An exercise in fruitility
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Maybe one of the boox devices might fit your description?
Nehme mal versuchshalber das neutrale Femininum und finde heraus wie gleichwertig es gesehen wird zum neutralen Maskulinum…
Maybe the gpoddersync-nextcloud app is more your thing? You can use that with all podcastapps that support gpodder sync. Works with Antennapod on Android and Kasts on KDE/Kubuntu.