One of the problems with Funkwhale is that it only works well when all files fed to it are correctly tagged with artist, album and track data which is not the case with many 'discovered' tracks. Untagged (or badly tagged) tracks are hard to impossible to find in Funkwhale while e.g. Airsonic has no such problems since they have the option to navigate the collection through the file system. Add to that the fact that 'sharing' music - which is part of the concept of Funkwhale - has been demonised and sometimes criminalised and suddenly there seem to be few upsides to running a 'Pod' (which is how a Funkwhale collection is supposed to be called). I've been following the project for years and have been running an instance on and off but always went back to one of the Subsonic forks.