I think that you are being misleading when you keep hammering the privacy aspect. Yes, end-to-end encryption means that only the people participating in the conversation can decrypt the messages. But as Annie, the service built by you, is part of the conversation, you as the creator also have, by extension, access to everything people send to the bot. I would otherwise laud your project, if it wasn't for this aspect, which to my eyes seems intentionally misleading.