Not OP, but yes believe it or not it's impossible to find certain movies anywhere other than pirating them. One example is "Pirates of Silicon Valley", I watched it when I was young and recently wanted to watch it again. I pay for basically all the streaming services, I'm would have been happy to rent it from any service at all. I spent several hours trying to find a way to pay to watch it and never could.
This is an old relatively low budget TV movie, it's not on TV+ (which I subscribe to). Nor can you rent it on iTunes, it doesn't even show up when you search for it. Same for Prime Video, etc.
Apple TV doesn't allow me to stream in my browser, so I happily pirate their content. I pay for all the other "big" streaming services that I can use like a normal person.
