I guess the point is that they got this level of success (which GOG didn't reach) because they're based in US.

And I tend to agree with that, there are some reason, including the fact that it's a huge country with a wealthy population that use loans and credit cards to buy even more that they can afford. That creates a strong domestic market that you can leverage before having to look at international sales.

Nothing to do with the US government policies of course...

Epic was founded in US and didn't reach such success too. I think this is not because of US based, more like because of Gabe Newell.

Good example. I’d want to look at the first-mover(ish) advantage Valve had and other differences in product timing/delivery before I concluded it was impossible to found a company like Valve in the EU.

I am interested in knowing why it's impossible. Only because of first mover advantage?

I think you’re reading my post wrong. I’m not stating it’s impossible.

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You're right, sorry.