Until the past couple of years they were almost entirely dependent on government contracts from shady three-letter agencies, and most of the work required a security clearance (now it's a little closer to 50/50 government contracts and Fortune 100-type companies). Not to mention they were literally funded with millions of dollars from the CIA's venture capital arm. Suppose they had been shady - I'm not sure we'd know about it. You probably should have had an 'inconclusive' group somewhere in the middle and they would have at least fit there.