If convenience is more important than privacy, then by all means, use WhatsApp! It backs up your data unencrypted to the Google cloud. Or use Telegram. It backs

If convenience is more important than privacy, then by all means, use WhatsApp! It backs up your data unencrypted to the Google cloud. Or use Telegram. It backs up your conversations to Telegram servers, where Telegram can read them. Convenient, yes. Threema values convenience, but only if it's not in violation of your privacy. As an example of this, the Threema Safe backups are anonymous. We don't know which backup file belongs to which user. This has some usability downsides, but the obvious huge upside that we don't know which backup file belongs to which user. Another example: Your avatar is not stored on any server. Instead it's sent along with your messages if it changes. This has the usability downside that people won't immediately see your changed avatar if you don't exchange any messages. However, it has the advantage that we don't know how all our users look like (in case they use a picture of themselves as avatar). As a service provider, user data becomes a liability. The less you have, the better :) In German, there's a word called "Datensparsamkeit" (data frugality) that describes this concept well.