Whilst it's DRM free, it's still licensed copyrighted content that cannot be shared unless the license permits. BandCamp's terms of use state that they take non-exclusive rights to sell and distribute works on your behalf, but they do not grant those same rates to buyers.
DRM is not Licensing, but a mechanism to enforce a license.
I think OP is implying that the sharing provided in funkwhale is likely violating the typical license terms of any purchased music, therefore is preventing a musician from making money from streaming services which have appropriately licensed the music for streaming.
Buying a license doesn't mean that you own the work, just that you have the right to play it in specific circumstances (most of which nobody pays attention to anyway). I'm sure we've all played a song on a loud speaker for others to hear, but again that's against typical license terms.
DRM is not Licensing, but a mechanism to enforce a license.
I think OP is implying that the sharing provided in funkwhale is likely violating the typical license terms of any purchased music, therefore is preventing a musician from making money from streaming services which have appropriately licensed the music for streaming.
Buying a license doesn't mean that you own the work, just that you have the right to play it in specific circumstances (most of which nobody pays attention to anyway). I'm sure we've all played a song on a loud speaker for others to hear, but again that's against typical license terms.