Does it lead to employees/groups competing with each other to keep their job? I've experienced that at one of my gigs and it just kills my morale. I have a habi

Does it lead to employees/groups competing with each other to keep their job? I've experienced that at one of my gigs and it just kills my morale. I have a habit of helping co-workers. Then, I notice that I don't always get any acknowledgement in front of mgmt. At the end of the year, the people doing perf reviews don't seem to always know what role I had in some of the successes. At a previous employer where this stack ranking stuff was not prevalent, my coworkers were very generous with their sharing of credit (as was I). As time goes on, I feel I am being a naive person and have no one to blame but myself.