Non-natives English speaker pick their English where they hear it. If you're watching British television or speaking with English people a lot, you'll surely pick some English colloquialisms.

Correct, I was mostly responding to ‘due to British spelling’ in connection with Nakamoto. The claim that some American spelling crops up in his writing (on the linked-to Wiki site) actually supports the idea that he is neither a native Briton nor American, but learnt British spelling in school and American spelling on the net.