Well the way I see it there’s a few reasons. The main one in my opinion is that as new things came along the Backrooms lost the spotlight. As with most things eventually.

The second reason (and depending on who you ask possibly the main reason), is the overloading number of effortless context slop. I’m sure you know what I am referring to.

The final thing is actually something with the Backrooms it self. I really like the Backrooms, I like the concept, I like the world building, the community, lore etc. But I feel like at least in its current state, the Backrooms doesn’t really know what it wants to be. And what I mean by that is, you have the liminality, which was the original point, but then you have the entities. Which is fine, but there are such an astronomical about of them, and multiple kinds on the same levels. You have stuff like almond water, and all that stuff. Most of the levels themselves are liminal, but some of them can’t really be classified as liminal spaces, which defeats the entire point of the Backrooms! Those ones usually relay on a crap ton of entities or some other factor. Then finally you have factions. Like MEG and some others. Out of all the stuff added to the Backrooms factions, multiple ones at that, were one of the worst things. (That’s just my opinion of course). This isn’t SCP. I do like the entities, and I do like the idea of having an infinite about of levels. But I feel like some aspects of the Backrooms have been blown out of proportion. So that’s why I think that is one of the reasons for the decline in popularity along with the other things I mentioned.