You know, Linux only exists because of anti-trust action by the US Government.
Unix was never FOSS as we know it, but Bell Labs shared it pretty liberally, source code and all. This wasn't out of the goodness of their hearts, but because they were legally required to make their works available to academia and forbidden from entering the computer market.
Not only did Linux borrow the basic design of Unix, it also copied the distribution model of sending source code to those who ask. And, of course, Unix also inspired and set expectations for the whole next generation of operating systems, like DOS, Windows, NeXT, and MacOS.
So much public good because we stood up and forced a monopolistic tech company to share its work. I think it played a major role in making computing more accessible and innovative for decades.
Personally, I think the tech industry needs more interventions like this.