The core problem is licensing deals. And it's not just limited to movies, but games. Even the biggest juggernauts can't get out of this, with patches removing soundtracks [1].

A CD or DVD? That will hold the soundtrack for all of eternity (or at least as long as the physical medium survives), but for digitally bought games, it's ridiculous that content I paid for can just get silently patched away.

[1] https://gamefaqs.gamespot.com/boards/868277-grand-theft-auto...