A vulnerability in WhatsApp was abused to install surveillance malware on phones of journalists and human rights activists. To make sure that potential vulnerabilities are found quickly, the code must be open source. That's why all Tutanota clients - web, apps, desktop clients - are published under GPLv3.
@Tutanota Server side too?
@gemlog Not yet, but we plan to build a small server for self-hosting, which we'll publish as open source.
@Tutanota Cool! Thanks for replying - and so quickly too.
Server run by the main developers of the project It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!