Music Stremio would be cool, but I think hosting it yourself is the closest you can get with music while still retaining a decent user experience :/
I guess they could also throw a load of adblockers onto YouTube? Ublock Origin, ReVanced YT Music etc. But that isn’t really ‘piracy’ at that point if OP is purposely wanting to avoid the actual big names.
I’m not sure if OP is privacy focused, or doesn’t want their playlists tied to one service, or something like that; I’m just pulling assumptions out my arse.