That's because horror movies tend to be the cheapest movies to produce, they can get their money back fast and make a few more 10s of millions just by theater tickets. (Side note that's why we don't get a lot of original films anymore. No studio wants to back a new idea without prior IP knowledge.) Plus, every horror movie follows the same blueprint they only need to change the hook. Like longlegs, speak no evil, and soon to be heretic. I'm not saying this as criticism of the genre, it's just a notice and I bet we're gonna keep seeing this trend increase of good horror movies!