My spouse loves watching old direct to home video movies and I'd say about 75% of them have no accessible copies outside maybe eBay. Most of the remainder are only available via piracy. A vanishingly small percentage are available from streaming platforms.

One that I wanted to watch recently was Disney's 2000 animation short John Henry. It's now part of the American Legends compilation, which is only available for purchase on Amazon, not rent. It's not even on Disney+.