Sal

As far as I known, subsonic is currently closed source and other reimplemented the api with open source programs. Than some people got together to make a standard that was not tied to a closed source programs.

https://opensubsonic.netlify.app/

Depending on how many people you want connected, could try something like tailscale or zerotier. I been using tailscale and I think it is easier.

I would be surprise if an ISP would let a house get the business plan.

Some like r/dndmemes say it is indefinite.