I dropped Whatsapp for Signal the day after Facebook bought it. Told my friends who use it that is just a matter of time before they wreck it and exploit it for targeted ad purposes.
Took them a little longer than expected but they announced a couple of years later that they were researching how to do it. And, of course, they cross link your Facebook data and WhatsApp data.
Lots of articles out there on the topic but here’s an excerpt from 2021:
Earlier this morning, Facebook confirmed to The Information that it is developing a team that includes former Microsoft AI researchers and cryptographers to find new ways to collect data from encrypted sources such as WhatsApp–without technically having to decrypt the information.
Facebook can go fuck a duck and I’d never trust anything they’ve touched