It is not hard at all if they are willing to pay big bucks. They want to game the visa system, suppress the wage, and get cheap labor. Just take a look at all the profits Apple, Google, Microsoft make every year. And yet, they still collude together in order to suppress wage, given the high housing prices in the bay area [1].
[1] https://en.wikipedia.org/wiki/High-Tech_Employee_Antitrust_L...