Earlier quoted context omitted.
How so? Most of the hardcore encryption stuff was built at Facebook under the founder's supervision afaik for the purposes of making it harder for Zuck to inevitably ruin the privacy aspects. I personally don't use it, because it _is_ loaded with engagement bait but its not all worse and is better in some ways.
They added ads, an "AI companion", and backdoor logging of all chat messages
“In the ordinary course of providing our service, WhatsApp does not store messages once they are delivered or transaction logs of such delivered messages. Undelivered messages are deleted from our servers after 30 days. As stated in the WhatsApp Privacy Policy, we may collect, use, preserve, and share user information if we have a good-faith belief that it is reasonably necessary to (a) keep our users safe, (b) detect, investigate, and prevent illegal activity, (c) respond to legal process, or to government requests, (d) enforce our Terms and policies. This may include information about how some users interact with others on our service. We also offer end-to-end encryption for our services, which is always activated. End-to-end encryption means that messages are encrypted to protect against WhatsApp and third parties from reading them.” (https://faq.whatsapp.com/444002211197967)