One of the words commonly used to describe the backrooms is infinite, and while yeah certain levels may be written to be never ending and constantly be shifting and morphing into new places to explore I don't believe the concept as a whole can be infinite. As far as levels go, I believe there are not an infinite amount of them that one can travel to. If this were the case then doing literally anything at all in any level could theoretically send you to some new and random place. I'd like to know if i'm on to something here or if i'm just speaking nonsense.
yoink_