Not at all. It was born thanks to Linus, but it exploded in popularity and gained its contributorship precisely thanks to the promise of GPL that volunteer work will remain for public benefit.
Without the ability to say that, a corporate entity could have taken volunteer work so far, built a closed-source solution on top of it, and ran with it commercially, with no repercussions with great results.
In fact, we have just that example at hand: Apple.
> The existence of copyleft is the result of being forced to live within the domain of copyright
Sure, by that logic the existence of copyright is the result of being forced to live within the current socioeconomic reality.
The existence of copyright hinges on existence of property in general and intellectual property in particular. To eschew that is to propose a stark foundational change to society.
Sure, if we imagine a world where there’s no corporations hiding the source from users, everything belongs to everyone, no one is recognized for their work or has any control over it, etc., we can say that copyright is non-essential. There will be many questions to that reality, of course (for example, what would drive innovation in that world, not that innovation), but it has a right to be considered as a thought experiment. It could even be more desirable than the reality we live in!
However, we don’t live in that reality, and what people tend to mean when they propose getting rid of copyright is a half measure—a reality which has nothing in common with the above, which is all the same as now, except with copyright protections removed, which used to be a hindrance to pirates but now with the advent of LLMs is a massive issue for corporate interests building their new empires on top of our original work.
You yourself drop this “existence of copyright” idea and then proceed to argue that terms should be limited—as if I would disagree with that!