I don't believe that many "for-profit" libraries exist. Either they are publically funded (and will always be relevant because for a certain portion of the population, the library is the only place they get regular access to a computer) or they are part of a larger for-profit organization, such as Universities, and they exist not to create profits but as a necessary repository.
>Why the hell would I venture outside into the worst timeline to borrow a book that some gal read on the toilet while menstruating and picking her nose?
Personally I prefer reading physical copies, and furthermore depending on the tome a library might actually be a better place to get your hands on something. I have been fucked over trying to get free copies of books online that libraries had access to, furthermore, what your library has access to isn't just that library, if it's public it's geared to have books delivered from all over the country. I've used this loophole before to get access to a book that had a waiting list 10 people long, but I could get the physical copy for like 1$.
Public library jobs in big cities are famous for being the worst ones. Your sweet spot is either a university library, so the clientele is higher, or a rural library, where it is basically dead a 100% of the time and you can just goof off most of the time.
I would unironically be a librarian right this moment anywhere but giant cities if a Master's wasn't required, very comfy.