The US is a large, rich homogeneous market with a population of over 300 million. There's no wonder foreign companies want to get a foothold in this market, and it's no wonder US companies don't tend to look outside of the US until there's nothing to do in the US.
Sure, but that's exactly my point: The primary factor limiting EU startups isn't regulation, it's that they don't have access to a large, homogeneous, monolinguistic market
I don't think anyone disagrees about that.