This fact is subtext to a lot of the flamewars that occurred between these "greybeard hackers" and mainframe programmers on the one hand, and Windows PC programmers on the other hand. In both cases, the greybeards saw their counterparts working at IBM or Microsoft, or working at other companies developing software for z/OS or Windows, as people who were willing to "sell out" and work for "the man." (Not "the man" as in Microsoft/IBM; "the man" as in the government's various three-letter agencies.)
This was also the original subtext of Microsoft and Apple's fight over personal-computer market mindshare. Bill Gates and Paul Allen came from money, met at a private prep school, and shared a vision of selling their software to companies like IBM, who would drop thousands of copies top-down into enterprise partners' offices. Steve Jobs and Steve Wozniak were introduced because of a shared interest in illegal pursuits like phone phreaking and LSD use, and wanted—sort of like the One Laptop Per Child project—to empower individuals by putting computers in their hands. (Consider: they were probably envisioning use-cases exactly like "being able to share copies of the Anarchist's Cookbook over the Internet.")
Apple and Microsoft today are more alike than different, but they started off with diametrically-opposed cultures and corporate visions; and which ecosystem you bought into (at least back when) could tell people a lot about who you were as a person. There was a reason Apple found its first beach-head in schools: the schoolteachers of the 1970s shared pretty much the same countercultural ideals.
Read through the Jargon File, or the fortune(1) database, and you'll quickly get a sense of what "hackers" as a culture were like. A modern Stanford-MBA-alum YC applicant, who fancies themselves a "hacker", might be a bit shocked :)
Nothing sudden about it. If anything, this trend is a return to normalcy. Hackers have traditionally been fairly opposed to authoritarianism, including - but not limited to - that expressed through the mechanism of governments and nation-states.