It felt a little weird that they didn't differentiated pricing. Charging 1€ is adds a little to much overhead per transaction, and maybe not everyone has a credit card. It seems to me that an alternative would be to charge e.g. 5, 10 maybe even 20€ per year in western countries, then step the amount down depending on the economy in each region, bottoming out at e.g. 5€. Then just let the app be free in the rest of the world.

That way a user in Europe could "subsidize" 4-10 users in the developing world. Maybe that's a little to social democratic for a corporation.