How Google spent 15 years creating a culture of concealment

Is this different from retention policy at any other business with competent lawyers?

At my previous company (a big semiconductor vendor) the legal dept made it clear that if you had a question, you did not ask them by text. You rang them, because that made it privileged. But they didn't try to escape from discovery of emails - they were retained.

Actually they wanted some retention, because for them a big thing was to have evidence of the date you invented something in case of patent litigation. Everyone was given a paper journal in which you were supposed to make notes, which I totally failed to do.