The agencies have vast powers over tech companies, and tech companies do not want to cross them. Tech companies are also regularly legally barred from disclosin

The agencies have vast powers over tech companies, and tech companies do not want to cross them. Tech companies are also regularly legally barred from disclosing the mere existence of national security investigations. https://en.wikipedia.org/wiki/National_security_letter https://en.wikipedia.org/wiki/National_security_letter A big tech company openly saying "the CIA just called me up and told me to do something" would be suicide.