I think they would link all your accounts by phone number. This may not appear directly in the front end app. Most likely though in the background they will us

I think they would link all your accounts by phone number. This may not appear directly in the front end app. Most likely though in the background they will use these links as ways to package your identity up when selling to advertisers. Thats what I'm guessing is the end goal , enrich their stagnant platform (FB) with their growth platforms (WhatsApp and Instagram)