Beyond microblogging with ActivityPub

A lot of Geocities didn't get archived. A whole bunch of content from Myspace vanished forever after a large database migration failure, and a shitload of music from the 2000s is pretty much gone forever as a result. I don't think decentralisation or open access to data necessarily guarantees data is kept (if you tie data access to the owner and the owner doesn't care, the data's going to vanish even if it later turns out to be historically interesting), but I also don't know that this fundamentally matters - the whole of history is littered with lost data and references that can't be followed.