A lot of these are people who have never made a movie before. Maybe they made one with their friends, or while getting a film degree, but that’s it.
For some reason, they’re almost always horror movies. I think a lot of new filmmakers think that would be the easiest movie to make, for some reason.
I had a friend come to me and say “hey I want to to a 60 second Guardians of the Galaxy parody, here’s the setup.” I said cool, an wrote it in the back of a 70’s crown vic during a car chase. Figured we could fog the windows and put the chase cuts in post. They were ADAMNT it be shot in 6 locations
Probably because horror's seen by a lot of people as an unserious genre with low budgets and no real concern for quality. It's why it's also the go-to genre for hacks whenever a recognizable IP hits the public domain
Historically, it has been. Horror movies are pretty cheap to make compared to other genre films (karo syrup and red food dye aren't expensive). Plus a lot of people writing "how to make films" books worked during the VHS boom of the 80s/90s where any crappy horror movie could get distribution.
Apparently it's because horror fans will watch literally anything and don't care if something was low budget (as a horror fan, I can confirm). So it is less of a financial risk.
Studios will often give new directors a horror film, because no matter how badly it goes people will want to watch it.
As someone that’s been in one of these D horror slasher movies and knew people that worked in that world — it’s very easy to make and very easy to sell but not easy to get a return on investment. Everything has to go right. The one I was in started filming in 2014 and released on Amazon 2019
I don’t think horror is easy to make, but it can be cheap to make. A lot of the best horror never shows you the scary thing, letting it lurk larger than life in your imagination. Also, it lets you turn having no budget for lighting into a stylistic choice.
I remember in Bruce Campbell's autobiography they checked a lot of drive-in theaters and found that the easiest things to sell were sci-fi and horror, and they figured it was a lot easier and cheaper to make a horror movie than sci-fi.