Your cloud backups are not encrypted either, and you have to explicitly opt out of cloud backups. That means any chats or group chats that involve someone who hasn’t opted out are sitting unencrypted on Meta servers, even if you personally have opted out. Even if everyone has opted out and assume it’s encrypted, they still know who you’re talking to, when you talk to them, how frequently, etc.
Your cloud backups are not encrypted either, and you have to explicitly opt out of cloud backups. That means any chats or group chats that involve someone who hasn’t opted out are sitting unencrypted on Meta servers, even if you personally have opted out. Even if everyone has opted out and assume it’s encrypted, they still know who you’re talking to, when you talk to them, how frequently, etc.