Why is there no sense of "camaderie" in the workplace?

So when I worked in last 2 roles, I'd joke around and have a laugh with colleagues, the workplace culture of those places I guess was more relaxed, but I got that sense of lack of camaderie or fellowmanship from others too during my time working.

Sorry to be naive, but is it because some people look out for themselves and it's kind of "Yeah you're a funny guy but uh.. when shit hits the fan I ain't there with you" kind of shtick.

Not saying these guys are assholes or anything, but I just think with the current world in any work industry it seems to be tricky to make real friendships inside and outside of work.

I don't know if this just me but I notice that big distinction of the joking around and sharing the same invested topics (I.e. video games) but no more than that

TLDR - Confused if people are being genuine, but they don't really "care" in a sense?

Please let me know if I'm spouting gobbledygook, thank you.