The longer you work anywhere -- and I mean ANYWHERE -- the more you see the bullshit and corruption and crappy rules or policies and inequality all over.
For me it has been about the 3 year mark anywhere I've worked: once you get past that, you fade away from "damn I'm glad to have a job and be making money!" and towards "this is absolute bulls#!t that [boss] did [thing] and hurt the workers in the process!" or similar
Funny, that's actually what motivated me at my last job. Things were fucked up, but not so fucked up that it was overwhelming. It was the Goldilocks zone of just fucked up enough that I think I can not only fix it, but look good if I do. It was a fun journey, all told, but there were definitely frustrations, even ones that lasted years.