I feel that a lot of what the OP mentions is not really solved by self-hosting. Has does self-hosting solve Netflix problems? How does it stop Spotify changing

I feel that a lot of what the OP mentions is not really solved by self-hosting. Has does self-hosting solve Netflix problems? How does it stop Spotify changing your playlists? Sure, you can create your own jukebox of music files but the reason you pay for Spotify is unlimited access to a lot more music than you would ever buy and easy use between devices. There might be a few use-cases where self-hosting is a bit less risky than losing everything but I suspect for most people, the online services are just easier. That said, if you pay for stuff, you are more likely to get some proper support. I pay fastmail for my email because they provide me email and support in return for money. You can't use free GMail and then complain that they have broken something or locked you out.