alt Hacker Newsno it's not 15Gb/movie
A UHD movie with UHD and dolby audio and all that is anywhere from 50 to 70Gb. That's if you rip it straight off the disc.
You can shrink it a little by being pickier about which audio tracks you take, but not much.
You can do other things to it to make it smaller, but then it's not the equivalent of the physical disc
That's a bluray rip. AFAIK every streaming service is way lower bitrate than that, even at maximum quality.