alt Hacker NewsIt's a proprietary, closed-source application. It can do whatever it wants, and it doesn't even need to "backdoor" encryption when all it has to do is just forward everything matching some criteria to their servers (and by extension anyone they comply to). It's always one update away from dumping your entire chat history into a remote bucket, and it would still not be in contradiction with their promise of E2EE. Furthermore, it already has the functionality to send messages when reporting [0]. Facebook's Messenger also has worked that way for years. [1] There were also rumors the on-device scanning practice would be expanded to comply with surveillance proposals such as ChatControl a couple years ago. This doesn't mean it's spying on each and every message now, but it would have potential to do so and it would be feasible today more than ever before, hence the importance of software the average person can trust and isn't as easily subject to their government's tantrums about privacy.
0. https://www.propublica.org/article/how-facebook-undermines-p...
You are also using proprietary, closed-source hardware and operating system underneath the app that can do whatever they want. This line of reasoning ultimately leads to - unless you craft every atom and every bit yourself your data isn't secure. Which may be true, but is a pointless discussion.