> If you didn't have iCloud backup enabled then they've always been E2EE.
Correction: if you and the person you're messaging both didn't have iCloud backup enabled. And also it's worth noting that Apple forbids you from using any cloud backup system other than theirs.
If this is true, how is that legal?
1. Don't turn on iCloud Backups and receive E2EE on your messages 2. Turn on iCloud Backups AND advanced data protection and recieve E2EE on your messages
This is not some kind of nefarious plan on their end. Any user service will have a vulnerability on the user end of back-ups. For instance, Whatsapp backups will also have their keys available to Apple/Google. They need to offer this as for most users, the risk of losing their whole digital lives because they forgot their passwords outweights E2EE. For users who find that important, they have the two options listed above. Sounds like an appropriate trade-off to me.
> They need to offer this as for most users, the risk of losing their whole digital lives because they forgot their passwords outweights E2EE.
There is no clear trade-off that is an option.
These apps are not e2ee if almost every user has in effect encryption disabled.
Signal will be backed-up on iCloud _by default_ and client side will be an issue.
No, it absolutely is not. It seems like you don't have a good understanding of how actual E2EE systems work.
(Yes, it would be nice if the user didn't need two passphrases for this use, but Matrix cannot safely revert to key derivation because client could accidentally leak the master password to the server due to existing implementations.)
I've been using matrix. It's e2ee and multiple client sessions seem to be working just fine, they all sync without problems.
Here is the explanation why it's completely impractical and therefore doesn't provide actual privacy, along with other anti-privacy configurations: https://news.ycombinator.com/item?id=37875370
There are ways to opt out. But that's for the margin of people who worry about these things. So what that comment said is very relevant and accurate.