Why do I emphasize "seem". Well there have been several German initiatives for using open source, but non of them stuck very well. Munich's going Linux comes to mind, but there were others. And I'm afraid that this may be another such "attempt", while I hope it this time different as their national security is a at stake.
Telling everyone to communicate with GPG-encrypted emails has shown to be too hard on users, who then simply use one of the many less-secure channels. You have to do something, or you know they --the US mostly (WhatsApp, Twitter, GMail/Chat) -- will listen along with everything.