That is true for all media purchases since the invention of copyright in 1662.
You think you own the Silmarillion because you have a paper copy? Hah! No, you have a transferrable license to read it.
Every hard copy movie you have starts with a big green FBI warning reminding you that having that disc does not means you own the movie, it means you have a transferrable license to play it for yourself and small groups on small screens.
Digital media with DRM allow content distributors to remove the "transferrable" part of the license if they want, which often allows them to sell for cheaper since they know that each sale represents only one person recieving the experience. The license comes with less rights (no transferrance), so it can be priced lower.
You think you own the Silmarillion because you have a paper copy? Hah! No, you have a transferrable license to read it.
Every hard copy movie you have starts with a big green FBI warning reminding you that having that disc does not means you own the movie, it means you have a transferrable license to play it for yourself and small groups on small screens.
Digital media with DRM allow content distributors to remove the "transferrable" part of the license if they want, which often allows them to sell for cheaper since they know that each sale represents only one person recieving the experience. The license comes with less rights (no transferrance), so it can be priced lower.