I think right now it doesn't mean anything :/. It's more a 'wait&see' situation... However as many many other stories in the past, this doesn't sound good and bitwarden is slowly and carefully following the 'enshitification' path !
Keep an eye open and get ready to switch to another password manager (maybe a fork?).
If you're on Android there's InnerTune. It's basically YouTube music but for free ! Just to bad you can't directly access downloaded files to export them elsewhere. (Yeah that's practically piracy and illegal)
I like navidrome + Tempo as self-hosted solution. Works well without any issues. However, I read about horror stories people losing all their media or fucking up their media library ?
Also, that's a huge song library (20.000?)... Not sure this can be easily handled over to a self-hosted solution? But first you need to organize your songs