Because this kid obviously has drive, ambition, and talent. Caring enough about his dream to put together a site and posting it to HN demonstrates that he's paying attention and he wants to connect with other driven people. Also that he spent 4 days on it when he could have been out partying shows a good deal more vision than a lot of 19-year olds.
He also is willing to make sacrifices and go halfway across the globe to join a team. Doubt you'll see his manager worrying if he's spending too much time on reddit.
It's also a big deal to leave your country and go somewhere where you have little base.
So in a nutshell, because he has the classic immigrants ambition, and won't rest on his laurels like perhaps someone who was born here would.
He also is willing to make sacrifices and go halfway across the globe to join a team. Doubt you'll see his manager worrying if he's spending too much time on reddit.
It's also a big deal to leave your country and go somewhere where you have little base.
So in a nutshell, because he has the classic immigrants ambition, and won't rest on his laurels like perhaps someone who was born here would.