Telegram's "Saved messages" is another.
Also when you say: don't trust Telegram, while not saying anything about WhatsApp, you are, on average, pushing people from a solution that isn't proven to be trustworthy to a solution that is proven to be untrustworthy.
Because unless you simultaneously point out that WhatsApp is worse, that is where people will go if they listen to you and avoid Telegram.
(Even in general, I think that Telegram is no clear win over WhatsApp, and in fact I'd consider it worse in terms of chat message security.)
I really can't understand why you bright folks here on HN falls for WhatsApps marketing.
E2E means absolutely nothing as long as the messages are siphoned away in broad daylight.
That said: avoid Telegram all you want. But if you mean no one should ever touch it, I hope you are also against physical mail which is way less secure and also email which is way less secure than Telegram.
I don't have that backup enabled. Does that mean that WhatsApp is secure for me with everyone who also has that disabled?
I don't see how Telegram is better in that respect; the server sees all messages directly. It doesn't even need a documented backdoor like you described.
> under an agreement that let Google rummage through them(!) to their "send the data in a sidechannel directly to Facebook for analysis while also sending it end-to-end-encrypted to the recipient".
*EDIT*: Can you give a link to that agreement? It'd interest me. :)
> But if you mean no one should ever touch it
That's not what I said.
As long as no one of them enables it, probably.
I don't know if this agreement is in place any longer, but you should be able to find references to it using a search engine.
I've not found it quickly. I found this article which doesn't mention it: https://www.eff.org/deeplinks/2016/10/where-whatsapp-went-wr.... Since you made the claim, I'd usually ask you to substantiate it.
I admit the links I found now are less clear than I though and I don't have more time now, but there is clearly reason to be suspicious when 1.) Facebook stops encrypting data before upload 2.) Google accept to keep the data without counting it against the users quota 3.) sources claim there was a deal. None of these three carries too much weight on their own but together they paint a picture that something is going on.
[1]: https://news.ycombinator.com/item?id=28485312
[2]: https://www.theverge.com/2020/12/17/22180258/google-whatsapp...
[3]: https://www.documentcloud.org/documents/20428869-the_state_o...
So far Telegram hasn't been caught once the last decade while WhatsApp has been caught at least twicem