The exodus was so large that WhatsApp has been forced to delay the implementation of the new terms, which had been slated for 8 February, and run a damage limitation campaign to explain to users the changes they were making. Over the first three weeks of January, Signal has gained 7.
https://www.theguardian.com/technology/2021/jan/24/whatsapp-loses-millions-of-users-after-terms-update
https://www.theguardian.com/technology/2021/jan/24/whatsapp-loses-millions-of-users-after-terms-update