It's literally just "better then what people had" + they're willing to work through government and military contracting processes so it can actually be deployed in those environments.

They have a lot of "forward deployed engineer" roles which basically means staff with security clearances who get locked in SCIFs and provide on-site technical support.

Which is really why they keep getting hired: when you write into your contract "it stays on premises and technical support can't take logs off site" they agree to it (at a hefty mark up because all of that sucks to do).