In a world of digital distribution, manufacturing on demand, and multi gigabit home internet, the fact that it's more likely that a film is impossible to see than it is that I can easily find it is absurd.
It does not cost much money to host a DVD quality copy of a film on a streaming service. Storage is cheap, compression is very good. If no one is watching it, it's basically free at scale, a rounding error. HD and 4k get in to slightly more expensive territory, but logistically there's no good technical reason that every film ever made isn't available for us to stream at any given moment, and even less technical reason that I can't buy it on a DVD-R or whatever.
(Obviously, the barrier here is not technical, it's "legal" and "economic" which means it's bullshit.)