Google is silently linking phone numbers across accounts — the privacy risks and how to stop them
(www.androidauthority.com)
And they're probably making mistakes too. It's amazing how many data merges happen out there that result in wrong data. Not too long ago my credit card company sent me a new card overnight because of fraud, but they didn't send it to me, they sent it to a family member of my ex wife's. I've been divorced over 20 years now and I never even lived there. But the CC company decided to merge their data with other data and fucked up somewhere along the way.