Having watched the entire season I gotta say: "I ain't mad."
Overall a decent adaptation of the manga/anime. Sure, there are inaccuracies, but when compressing 3 seasons with a total of 47 episodes into a single season with 8 episodes, there's only so much story you can cover.
There's also Funkwhale, but that's more of a self hosted, federated SoundCloud alternative I think.
It's also primarily for self-publishing. When sharing music that's not your own I suspect you quickly run into the same issues as with torrents. With probably similar solutions.
I'll check out Spotube and SimpMusic, although the local music part is missing from your description.
But I solved the textbox issue by installing Microsoft Core Fonts with winetricks corefonts
Which would suggest that the limit is not given in number of characters, but text width, which would be such a strange decision, from a software development point of view.
Can you make it use a very narrow font and squeeze 6 characters in there? Just for the giggles.
Not like I had a choice