Earlier quoted context omitted.
I don't think it was an unreasonable assumption given that the article talks specifically about American fast food chains.
I guess three clues: * They were just trolling Firebase accounts for anything left open, and the first hit was a company that works with a bunch of American fast food chains. That doesn't require OP to live in the US. * They specified "America's fast food chains"; someone living in the US probably wouldn't qualify it with "America's". * They used a $DAY/$MONTH date format, which is uncommon in the US.
I call that US-centrism. Quite annoying to non-Americans living in the States.