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I'm actually still kinda surprised about this. My understanding is that the licenses from rights holders to streaming platforms generally included an indefinite right to stream to people who'd purchased content, even if they may not offer it for continued purchase or as part of the general included streaming library.
That's definitely how it works with games on Steam or GOG.
Unless you bought after-market keys like on G2A and it turned out to be stolen/keygen'd. Valve will remove your game if your key is found to be stolen (whether you knew it or not). I imagine you know this but just felt it bore mentioning.
Good point, yes, that's an exception. A justified one if you'd ask me but I guess YMMV.