We've fallen so far from the days when the retailer let you just have the game you bought and then they were out of the picture forever.
Advertising company (Doubleclick [1]) wants phone numbers to better target ads. No surprise there.
[1] The company currently calling itself Google is not the same Google as yesteryear. In 2008 Google purchased Doubleclick, and what happened is that the advertising rot from Doubleclick ate Google from the inside out. What we have now calling itself Google is actually all the evil that was Doubleclick, only calling itself Google. That's why the Google motto no longer includes "Don't be evil".
So will they also delete inactive accounts that have no phone number, but one or more phone-less 2FA methods associated?