You'd think so, but Uber has also been pinged by a Judge for handing over email which, among other things, says to "use encrypted email or chat", specifically "to avoid discovery issues":
* https://theintercept.com/2016/07/29/federal-judge-rips-uber-...
* https://prod01-cdn07.cdn.firstlook.org/wp-uploads/sites/1/20...