Regarding E2E Encryption, we have a nice enhanced SRP6a login module but interrupted the work completely a while ago to work on the map and C2S widgets and so this is more urgent.
Also would like quickly to talk about how to represent a group with an inbox.
We thought about how to activitypubify a whole map @pukkamustard might think we sleep but this was what I worked on last days ;
While we can easily extract Place from e.g. a Collection a user might want to communicate lots of infos via the basemap and the layers, e.g. raster or vector tiles and so we wrote objects for the best of them to easily stick unique AP maps together.