The movies, sure, but the Backrooms as a concept (and by extension liminal spaces in general) are not necessarily horror.

I don't find them "scary" but I do find them disconcerting.

Backrooms started from a photo of a liminal space but was introduced from a creepypasta and a thread on a paranormal board, it's always been horror adjacent.

> God save you if you hear something wandering around nearby, because it sure as hell has heard you