Also, if people start rooting around in everything they can take things out of context. If I send a message to my boss that I think that something we're doing is stupid, if that were public it could make some waves even though internally it's inconsequential because I'm a nobody. Also, many documents might have one or two bits that hint to really important information and having them can help finding those
As you probably know, there's tons of information in a multinational and the hardest part is finding the right stuff. This is one of the main tasks I use Copilot for. Also because outlook and SharePoint search are really terrible though. If those actually worked I wouldn't need copilot so much.
My mother-in-law is like this with knowing what various relatives are doing. Being the gatekeeper of knowledge gives her imagined power. I guess it's just part of the human condition.
I know sysadmins and programmers who behave exactly they same way. They could give you permission or a script to do the thing you need to do but they'd rather have you come to them and ask them to do it. Gives them a sense of purpose, I guess.
If someone shows me they are good at something they are going to have to expect being sent trickier problems.
Sometimes it might seem like I keep things a secret. I am probably just having a bad day.
I could be off base here about your experience, but I know that some people made the same comments about me when I pushed back on sharing dangerous credentials with inexperienced coworkers. Damned if you do, damned if you don't.