If you google "Unit 8200" that is pretty much the reason. The Israeli military pushes their super-smart kids together to be computer scientists and hackers for 2 years - this is essentially the NSA of Israel. Behind every Israeli tech company is a small cadre of unit 8200 grads.
When they finish, a huge network of Unit 8200 alumni who are already rich have a shared experience with these kids, and are ready to invest in any idea these kids have. They have a tight-knit group of incredibly smart colleagues as well, from their time in the military.