No EU lawmaker has ever said GDPR will be enforced worldwide. It's Github's and other sites' own choice to enforce it worldwide. They could also build two seperate websites.
> No EU lawmaker has ever said GDPR will be enforced worldwide
It literally takes 3 seconds to analyze the game theoretical effect of such a law to recognize its reach is well beyond Europe and therefore also clearly understood it to be such when passed.
Curiously, the EU cares more about the privacy of EU residents than it does annoying people who live elsewhere. Additionally, it "literally takes 3 seconds" to realize that the solution is to remove tracking cookies or block people from the EU if you don't want their business.
I think you're missing the point, I don't have that choice as the user of websites. When I'm googling for an answer I cannot choose which website I visit based on the sophistication of their cookie banner before I visit it.
The fact that this laws' reach is almost global is something called the Brussels Effect: https://en.wikipedia.org/wiki/Brussels_effect
But there is also the other way: simply not show a website in Europe at all. I see this sometimes when I click a link: https://imgur.com/a/A5S4drS