Engineers don't deal with the requests, lawyers do. No regular engineer at any big tech company is ever going to be in a position where they are responsible for such decisions.
Over a couple large public companies, I’ve had to react to a court ruling and stop an account’s actions, work with the CA FTB for document requests, provide account activity for evidence in a case, things like that.
Delete all docs we aren't legally required to retain on topic Y before we get formally subpoena'd. We expect it to be on XXX based on our contact.