Apparently, the chats are no longer private, and might be exposed to 3rd parties. The app now talks about “other Facebook Companies” and how they work with them to support “services, such as to provide technical infrastructure, delivery and other systems; market our services; conduct surveys and research for us; protect the safety, security and integrity of users and others; and assist with customer service.”. That makes private chats, almost public, if not now, then in some future.
The alternative is: https://apps.apple.com/us/app/signal-private-messenger/id874139669
The Signal app was overwhelmed with traffic, as many joined in past days, but now functions again.
Question: Will you abandon WhatsApp?