That last one’s going to need some substantiation.

“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)