My wife was planning a trip with a friend on Whatsapp and for the first time in her life mentioned something about renting a car. She never searched for it in G

My wife was planning a trip with a friend on Whatsapp and for the first time in her life mentioned something about renting a car. She never searched for it in Google or anywhere else but not 24h after that, car rental ads for the specific city she will be visiting started to appear in her Instagram feed. So I guess when Zuck talks about security that doesn't include privacy.