You’re misunderstanding what end-to-end encryption is. If they have a copy of your private key, it’s still end to end encrypted. The alternative would be akin to a TLS termination proxy, where your device would encrypt a message using Facebooks public key, they decrypt message, store it, and then Facebook uses your chat partners public key to encrypt and send to them. You cannot send an encrypted message straight through to your chat partner.
What I’m insinuating is that there’s no way to know if Facebook has a copy of your private key. The message is still end-to-end encrypted, it is encrypted by you using your chat partners public key, and passes through all of Facebooks infrastructure encrypted, until your chat partner receives and decrypts it. If Facebook stores the message, it’s stored encrypted. They can just decrypt it when subpoenaed or whenever they want bc they have the required private key.
You’re misunderstanding what end-to-end encryption is. If they have a copy of your private key, it’s still end to end encrypted. The alternative would be akin to a TLS termination proxy, where your device would encrypt a message using Facebooks public key, they decrypt message, store it, and then Facebook uses your chat partners public key to encrypt and send to them. You cannot send an encrypted message straight through to your chat partner.
What I’m insinuating is that there’s no way to know if Facebook has a copy of your private key. The message is still end-to-end encrypted, it is encrypted by you using your chat partners public key, and passes through all of Facebooks infrastructure encrypted, until your chat partner receives and decrypts it. If Facebook stores the message, it’s stored encrypted. They can just decrypt it when subpoenaed or whenever they want bc they have the required private key.
Ooo mb you’re right yeah, also when you use backups I read… ok something to look into for myself to understand better fr, thanks for this comment btw