If your encryption is not a layer on top of a messaging service, you have to trust that the service you’re using is actually end-to-end encrypted. I point this out because it means that encryption is not a protection against he service not doing what it says it does, but rather it is a protection against other things: passing data to governments, having a hacker break in and leak it, that kind of thing.

By storing stuff securely, it mitigates that problem, I guess. A government would have to have a “live tap” to know what you write to the LLM, rather than being able to slurp out all your historical conversations.