Mitchell suspects Nakamoto’s initial interest in creating a digital currency that could be used anywhere in the world may have stemmed from his frustration with bank fees and high exchange rates when he was sending international wires to England to buy model trains. “He would always complain about that,” she says. “I would not say he writes flawless English. He will pick up words and mix the spellings.”
And he worked in secrecy:
Not even his family knew.
The full story is here, fascinating throughout.
Addendum: Andrea Castillo adds comment.