Paypal's biggest problem on it's entire history was related to expanding internationally too fast. You open a door to larger profits, but also open a huge window for frauds of all sorts. Not to mention the regulations, that differ A LOT in different countries (just as a quick example, crediting dollars in an account in Brazil is forbidden - there's no "support" for this kind of transaction, so you have to go through a conversion process that is not only bureaucratic, but also VERY error prone and time consuming...)