The problem is that Stripe is still not usable in the half of the world, including my country, Romania.
I've lived for some time in Romania and I think I can see both sides of the issue here. Romania has some problems and companies like Stripe have to decide whether it is worth it to them to open up to a country that would in turn most likely (at least initially) yield relatively small volume in real transactions and a disproportionate amount of volume in fraud. From the Romanian point of view this sucks because those…
Actually, I don't exactly understand what Stripe do to "prepare" for the launch in a country? They are expanding very gradually, and there are payment processing companies which basically blanket-cover almost whole world. For example Stripe still marks Germany, Austria, New Zealand etc as "preview", and they were not available some time ago, but fraud and corruption definitely is not a problem there.