New research shows 11 of 21 "secure" messaging apps leak user data to Google's push notification servers - including 4 that leak message contents. None disclosed this in their privacy policies. Signal, WhatsApp, and Threema got it right.

https://arxiv.org/abs/2407.10589

We're working on a MIP for private notification architecture on iOS and Android for @White Noise, please review!
https://github.com/marmot-protocol/whitenoise-rs/discussions/388