My company recently interviewed a Theranos veteran - this person was a scientist working on a small part of the analytical pipeline. Apparently there were many, many smart people working at Theranos (including the candidate) who had no idea the company was a scam. This was in part due to intense secrecy and very rigid information silos within the company.
There’s probably a lesson to be learned there, of course - one too many “need to know basis” explanations and it’s time to start asking some hard questions.