Threema meets the requirements of the European General Data Protection Regulation (GDPR) and is also subject to Switzerland’s Federal Act on Data Protection (DSG).
Threema does not use phone numbers to address users and can be used anonymously without uploading address book data. It is therefore also suited for childern under the age of 16.
In contrast to conventional messengers, you can therefore be sure to comply with privacy laws when using Threema.