If you don’t own then aren’t selling it, by definition.
If you go to the movies, do you think that they should sell you the cinema? No, you’re for the right to sit in a seat in the theater for the duration of the movie. That’s it. You know what you’re getting and what you’re paying for. How is software any different?
They could sell you the software, just like they could sell you the entire cinema, but in neither case can you afford it.