It's true that Hubzilla has access permissions for files on your WebDAV folder, and those access permissions sort of federate to other Zot protocol using sites (but not the wider Fediverse), but Nextcloud also has its own inter-Nextcloud federation where you can access files on other Nextcloud instances right inside your Nextcloud.
those access permissions sort of federate to other Zot protocol using sites (but not the wider Fediverse),
there were improvements done in the last years... so with the OCAP function ( /settings/privacy ) and guest tokens ( /tokens ) we can share permissions for files across the Fediverse ... and even to people who do not have a Fedi Account jet
I don't really have a need for most of the features Hubzilla offers, so I think I'll stick to my Akkoma instance. But I encourage people to check out Hubzilla, as it is a neat project overall.