ELI5 How does end-to-end encryption messaging work after it reaches the end?
Edit: The question has been answered, please see from this comment onwards thank you
I'm familiar with public key encryption at the very simplest level. The idea is data should be inaccessible to anyone but the intended recipient, even to those systems that send the data.
But that applies to transmission. Once the data is on the device it must be unencrypted to make it accessible to you. At that point what is to stop a service accessing that data?