Reading through the indictment, it appears that BetOnSports was actively (and repeatedly) advertising within the US. I feel there's a rather clear line between operating in one jurisdiction and merely accepting customers from overseas , vs. actively seeking out customers and doing business in a jurisdiction where your activities are illegal -- I'm not sure I would categorise it as "completely legal in the jurisdiction you are based in" when you are deliberately doing business, and spending money, in another jurisdiction.