Agreed the network is much denser in Europe than the USA. This is obvious if you've really tried looking for network infrastructure services. The USA is just where a lot more high-level services are, like social media, due to the peculiarities of capitalism. There's no shortage of infrastructure there either, of course.

Data caps are apparently illegal here. This is good for the quality of infrastructure.

And if you have customers somewhere else you want to be in that place, or close to it network-wise.