The only interesting thing about the whole "backrooms" thing is the psychological phenomenon it's based on - dreams people have about endless corridors and strange liminal spaces. Plenty of people have dreams about the "infinite bathroom" for instance. Doors opening to doors opening to doors. Unfortunately all we get is jumpscary monsters in dingy yellow office corridors because no one knows how horror is supposed to work anymore.
That said, AI (despite being a cancer on humanity) is getting really good at replicating the surreal, dreamlike effect of what something like the backrooms should look like[0].
[0]https://old.reddit.com/r/aivideo/comments/1dowxjo/the_backro...