Private messaging apps undermine state public record laws "Open government advocates fear that private messaging apps are being misused by public officials to conduct business in secret." July 22, 2018 https://www.pbs.org/newshour/nation/private-messaging-apps-undermine-state-public-record-laws
That's the downside of improved privacy for individuals. Authorities could block access from government networks. But how could they police private devices? Still, how is this worse than old-school private conversations in meatspace? In coat rooms, bars, parks, etc? Bottom line, it's a trust thing. Trying to police communications is a losing game. Or rather, it'd be horrible if it were effective enough.