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.
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?
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thanks, I will check this out.
edit: okay that tutorial in the open issue helped a bit. I did already have the inkstitch-3.0.1-linux.sh but entering the flatpak cmd and have the script already copied to the extensions folder worked. Thanks a bunch!