It doesn't quite work like that. You don't go off and find some super smart person who can easily get a job at Nvidia and tell them "Hey you, go work for this company". You find someone who already works at Nvidia, and you bump into them at their kids' little league game, and you get chatting and build a rapport and over time you build trust and before you know, you've got a trusted source inside Nvidia. They don't even need to know they're a plant. And then, if you really do need something more than information you can go further. But you start with someone already at the company and you target them, rather than the other way around.

And that's not even talking about the less clandestine methods of just ringing their General Counsel and saying "Hey buddy we're the US government we need X Y Z".