Back in May of last year, we reported on a new campaign by Google to increase account security through a number of methods. As part of this campaign, Google announced its plans to push people to use two-factor authentication (2FA), saying that users whose accounts are appropriately configured would begin to be automatically enrolled in 2FA.

Then,

Source: Hot Hardware – Google Claims Forcing 2FA On 150M User Accounts Led To 50 Percent Fewer Hijacks