Surely there are tribes that transcend and cross corporations. That's why you can hire old colleagues and get a team up and running in a startup or new firm
But there is also a great deal of extremely mercenary behavior, in today's workplace (not just tech).
I suspect that it would be hard to have contiguous relationships.
I worked at my last company for 27 years. I knew many folks for decades.
I believe that this kind of thing is ... uncommon ... these days.