With the new updated policy, WhatsApp will start sharing your account information with Facebook to improve Facebook ads and products experiences. You can opt out from sharing your information with Facebook
What information is being shared with Facebook ?
Nothing you share on WhatsApp, including your messages, photos, and account information, will be shared onto Facebook or any of the Facebook family of apps for others to see. lean more here
How do I opt out from sharing my account information with Facebook ?
Uncheck the box shown below
Settings > Account > Share my account info in the app