[geepytee]

Never crossed my mind to self host my own music streaming server, great idea!

[meonkeys]

Music is straightforward to self-host. Go for it!

Video can be a bit harder if you have to transcode.

[prmoustache]

It is really only a thing because smartphone OS vendor make it difficult for people to mount filesystem over the network.

If you could ssh/sftp mount from android or iOS easily, your favorite smartphone audio player would just play those files from a remount mount without any need of a streaming server.