The country he mentions is Romania. Well, bureaucracy is high, but like other said, no need to setup a company in advance. But, he saved anyway way to little money ( I found strange that he is counting in USD, since euro is de facto currency, besides the RON ) to be able to sustain him and an apartment. Lessons learn: don't quit your job until you have some sale volume. However, since he's in Romania, he will get a j…
The majority of his sales would be in USD (with EUR second, except if he especially marketed to European customers).
And $ gives a standard reference across the world. For EUR many people around the world need to do the conversion first, but even someone in rural Nigeria or Polynesia would have a good grasp of the value of the $ compared to their local currency.