The problem with that line of reasoning is that the concepts and ideals of Free Software (and Open Source) existed long before proprietary software ever existed.
The formalization of the ideas behind FOSS arose in response to the change in the software world towards proprietary, closed products, yes. But FOSS was not a rebellion against those ideas so much as it was a continuation of the older ideas.
(And then there's people like me, who really don't care for Free Software much at all and vastly prefer permissive/liberal licenses, and who are more and more proponents of the Big Evil simply because they polish and improve products while many -- possibly most -- major Open Source projects seem hell bent on getting their crap 80% done, getting bored with bug fixing and polish, and then rewriting everything from scratch for fun while the users are sitting there with their thumbs up their butts wondering when they'll actually have a stable, bug-free, usable piece of software.)