It's not even doing a good job of that, though. The other day someone mentioned the 1990 movie "Taking Care of Business" with Jim Belushi and Charles Grodin. It's a pretty unremarkable movie, but I remembered liking it as a kid for whatever reason and wanted to see it again. Of course, it's not on any of the four streaming services I pay for (I'm outside the US so ymmv). And why? Why is the studio hoarding access to…
It will be available to any of those streaming services that the studio deals to take if they want to.
But those services buy x number of titles for y amount of money and your film is very obscure and would not get watched enough to justify a streaming service selecting it.
It is trivially available for an individual transaction, where the economics of making it available make more sense (but not infinite sense, listing/encoding/ingesting etc are not free, and people assume even the most obscure film generates more revenue than it actually does).