E2E encryption is one of the main points of iMessage.
Giving your iCloud credentials to someone that isn’t Apple is already kind of shady. They needed the security around this product to be bullet proof. I don’t know why anyone would be quick to trust Sunbird after this.
Are my messages secure?
Yes, Nothing Chats is built on Sunbird’s platform and all Chats messages are end-to-end encrypted, meaning neither we nor Sunbird can access the messages you’re sending and receiving.
And regardless, if they removed this line and added privacy policy like “we do not encrypt messages and can read them whenever we like” should kill their entire platform.
Security and privacy minded people dont use iMessage and not even an iPhone. The ecosystem is so close that you don't know what's going on behind just Apple.
Do you have anything substantive to say around E2EE encryption on iMessage?
The whole point of E2EE is so that a middle man, including the Apple, cannot read it. Apple has been very publicly opposed to providing encryption backdoors that could be accessed by Apple, law enforcement, etc. Backdoors usually get sniffed out and become widespread security vulnerabilities.