Whaaat? There's Android for jailbroken Kindles? Back in my day the only thing you could do with a jailbreak was installing a slow version of KOReader that didn't really work very well.
kadu
The Homebrew Channel for LG WebOS is got three pieces of absolutely essential software:
A YouTube app modified with built in ad blocking and sponsor blocking. The Jellyfin app. The Moonlight app.
With these three plus the toggle to block system updates your TV gets 1000% better for free.
for music: not streaming.
Music is a solved problem, the files are small even at FLAC quality and can be tiny with Opus whilst sounding transparent. Any SOC made in the last 15 years features a more than fully capable DAC.
Why even bother with streaming? Have a local collection of files. Even syncing is easy.
Remember when Plex tried to sell you a subscription to use outdated versions of open source game console emulators?
Plex wants to be a profit-driven company, but their business model is piracy. They'll squeeze you for subscriptions, while making your experience worse to try and broker a peace deal with content owners.
That's kinda the thing though, using modern codecs there's no way you'll get anywhere close to facing this issue. A song encoded with Opus at higher than necessary quality is 2.5 MBs on average - that's over 20 thousand songs in 50 GB, not even half of your total storage gets you 50 days of continuous audio.