@liaizon I did and I still don't quite understand how it federates anything. It also makes what has become to me a classical fediverse mistake: discovery is impossible. How do you find a song you're looking for? How do you know what instances there are? The beauty of Durov's VK was that you could just type the title/artist, click play and hear the song. And anyone could upload anything, so all the obscure stuff was there too. Mail.ru ruined it by making it legal, but that's another story.
@liaizon IMO it's of paramount importance to erase the lines between instances so that cross-instance interactions feel to the user as frictionless as those contained within their home instance.