If it's in your systems in an open format it's yours, if it's outside your systems or wrapped in some kind of locked format that forces you to go through somebody else's software it's de facto theirs.

Due to my own experience in software development with 3rd party solutions from way back, I never adhered to Streaming solutions (even though I was tempted) and always stuck to getting my entertainment in a media format I controlled (legitimately for a long as I could, not so much once even physical media started having DRM) because I was aware that it's risky to outsource so much control over one aspect of what you do (in this case entertainment) to an entity which, frankly, sees you as nothing else that microscopic fraction of their bottomline.

(The funny bit is that if Netflix would sell me their Series in an open file format that I could download and at a reasonable price, I would have sent lots of money their way, same as I spent lots of money on DVDs and even VHS tapes back in the day. In fact all throughout that period I was doing something like that for games: as soon as I discovered GOG with their DRM-free downloadable installers, I started acquiring all my games by buying them from GOG)

In the fullness of time, my caution seems to have been proven right.