https://www.theguardian.com/technology/2021/jan/26/uk-regulator-to-write-to-whatsapp-over-facebook-data-sharing

Information commissioner says the chat app committed in 2017 not to share contact and user information

The UK’s data regulator is writing to WhatsApp to demand that the chat app does not hand user data to Facebook, as millions worldwide continue to sign up for alternatives such as Signal and Telegram to avoid forthcoming changes to its terms of service.