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.