I would go so far as to say that calling YCombinator "training" is an outright lie. It's a business incubator and angel investment program; they pay you to deve

I would go so far as to say that calling YCombinator "training" is an outright lie. It's a business incubator and angel investment program; they pay you to develop a prototype, and introduce you to potential investors. I feel misled after reading the article. Not knowing the context, I assumed that he was actually referring to some sort of training; something like business school, in which you pay to be taught. Instead, being given an initial investment to form a corporation, write a prototype, and shop it around to venture capitalists is pretty much the definition of "doing business," even if it is only the first few steps. I can imagine why CBP officers would feel misled as well. And it doesn't help that he is saying he had no intention of keeping the business in the US. Starting up a business in the US just to take the capital and move the business overseas? This isn't something that a lot of border officers are going to take kindly to, nor is there likely to be much in the way of laws encouraging it. I would absolutely like to make it easier for successful, smart, and educated people to immigrate to the US, and make it easy for people to immigrate to the US in order to start a business. But going to the US to hit up investors, work for three months to get a prototype going, and then move the business elsewhere? You're going to have a hard time selling that.