I came across this early in my career in networking. I ended up having to support another technicians customer(we primarily managed our own workloads) and he did not use the tools(vault) we had to manage the network equipment credentials, so I always had to call him and ask him what the password is and why he doesn't update it in the vault(it frequently changed) ... After bothering him enough about it he said it was job security.

This was a 45k entry level job that he was years into. Why someone would want job security at the bottom part of the totem pole is beyond me, but that is where I mostly came across tribalistic tendencies(I worked in a lot of small/medium sized companies before getting a big break)

If I look up those people on LinkedIn, they're exactly where they were or in another lateral position. They don't tend to make it very far.