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Yeah that'll happen for anything streamed and licensed.
If you want to own something, you need to own it physically. Buy an actual disk. People won't and I'll be surprised if they are still making blurays at all in ten years but that's the only way you can actually buy media now.
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.
iTunes as well. There are a few things I can still stream that are no longer sold.