Kicking the can down to the endpoints -- but really, haven't you always had to trust your app / OS? Unless you coded or audited it yourself from top to bottom and built your own hardware (hah), there is always a level of trust required in the code/device.

https://www.forbes.com/sites/kalevleetaru/2019/07/26/the-encryption-debate-is-over-dead-at-the-hands-of-facebook/#55ac36aa5362