Google has so many features that users don't know about that they created a site that (1) gives users a random listing of their products and features to sort through, and (2) lets Google see which features/services get the most interest from the uninitiated users.
Every single card I flipped over had "Stuff you'll need: a Google account" and an early step that was "Sign in."
Google is on a real push lately to get people to stay signed into its services all the time. This, to me, feels like another pair of hands helping in that push.