While I agree it seems obvious you can’t do that, based on how these platforms have limited things for a long time… but that really should be something you can do.

Why can’t I get the file and put it on another device? Why can’t I burn it to a dvd? It makes sense that Apple aren’t required to make more software for random devices, but why can’t I have the file and do what I want with it?

Not at all (hence saying "obvious in hindsight"). Simply pointing out that, at the time, my purchasing decision wasn't influenced by how many use cases it would restrict.

Also, IIRC, there was a period where you could burn Audio CDs from music that you purchased on iTunes.

edit: turns out music purchased on iTunes is DRM-free!

Actually there were some DVD players back in the day that could play digital files burned to DVD or CD, and it was totally possible to burn DVDs that could play normally on most players from video files.

buying a video game at Walmart means you're only able to play it there, it's so obvious:)

Of course b̵u̵y̵i̵n̵g̵ licensing a movie on itunes...