Not some odd reason - he's an ex-pat in the finance industry. It's like how I had modified my pronunciation of 'cache' (although I refuse to change how I say 'data').

BankSimple are based in Portland, Oregon (so yes, US).

Unfortunately, banking is a heavily regulated industry and the laws vary (in real and significant ways) from one country to the next. Big, multinational banks do it by opening different banks in each country, each operating according to the idiosyncratic laws of that country but all owned by a parent company that moves capital around as needed. Building a single thing for handling money that works across national boundaries without breaking laws is incredibly difficult.

I found that jarring too. If I brought that seppo bullshit home the cheese n kisses'd be dark as a dingo's kidneys.