People are saying that you can buy movies online, but I think they're missing the key point of putting lots of movies on massive discounts and promoting the movies that are currently discounted. Like sure you can buy basically any movie on Amazon or Apple's store or wherever, but I know that wherever I go, it's going to cost $4 to rent a movie, except every once in a while when it's on sale and I get it for $3, and buying it is going to be some higher amount that is almost certainly not worth it. When steam has sales, I might browse and buy quite a few games that I'm not gonna play right away. Or I buy things in bundles because it just seems like such a good deal. If movies were usually $10 to buy, but the Amazon store had a very visible section of movies that were $5 or less, but for a limited time, I'd be way more likely to buy multiple movies that I'm not intending to watch right now.

I just opened the Apple TV app on my phone and "$4.99 Essential Movies" is listed prominently just under the top charts and new releases. I'm not trying to be rude, but this whole thread has people just speculating on stuff with limited self-awareness. The reason you aren't building a big film library is probably because you aren't that passionate about films, it isn't because no one is providing you a list of cheap movies. It's all there already, you just had to open the app.

Games industry has an oversupply problem that is the root cause of flash sales. I thought about mentioning that in my answer.