WhatsApp's interoperability agreement doesn't allow GNU (A|L)GPL licenses - eviltoast
Messaging Interoperability | Meta for Developers
developers.facebook.com
Enable users of your app in Europe to exchange messages with other WhatsApp users in Europe, ensuring compliance with the Digital Markets Act (DMA).

Relevant parts:

Partner represents and warrants that it shall not introduce into WhatsApp’s Systems or Infrastructure, the Sublicensed Encryption Software, or otherwise make accessible to WhatsApp any viruses or any software licensed under the General Public Licence or any similar licence (e.g. GNU Affero General Public License (AGPL), GNU General Public License (GPL), GNU Lesser General Public License (LGPL)) containing a “copyleft” requirement during performance of the Services.

Partner shall not: (i) combine Sublicensed Encryption Software with any software licensed under any version of or derivative of the GNU General Public License (e.g.; GNU Affero General Public License (AGPL), GNU General Public License (GPL), GNU Lesser General Public License (LGPL) in any manner that could cause, or could be interpreted or asserted to cause, the Sublicensed Encryption Software or any modifications to the Sublicensed Encryption Software to become subject to the terms of any version of or derivative of the GNU General Public License or other copyleft open source software

  • sweng@programming.dev
    4·
    8 months ago

    They actually did not. They clearly state (at least in the text posted by the OP) that you are not allowed to license under a version or derivative of the GPL if it would end up copyleft. The main condition is that it is licensed under a version of the GPL.

    (To be clear, I’m talking about the second quote, about combining)