[651549846546]

I've been keeping an eye on https://ibroadcast.com

It fills my use case precisely and has replaced GPM. They host my own library (various upload/sync clients), with a reasonable web/app+offline experience.

it has chromecast support, tag editing and all sorts.

I'm a little concerned how slow they've been to monetise. Free version transcodes to 128kbps, eventual paid offering ("around $3.99 USD per month", currently free) offers original-quality streaming. Not aware of any library or bandwith limitations.

Edit: avert your eyes - their landing page is atrocious but once logged in things are much better