Google does nothing, nothing!, without it being an attempt to track you. And the golden of tracking, is your real id and real location.
Even if the initial push for 2fa was security, by dev#1, you can be positive dev#2, 3, 4, xxx, 100 came running, and thought "tracking".
Google owes everything it is, to being the sleaziest, sneakiest, slymiest company they can be.
If the internet is an information highway, google is a van, stopping, and asking your kids if they want candy.
Were google a business in your physical neighborhood, tracking people as they do, they'd end up with a molotov cocktail through their window. No one would abide such behaviour, but the average Joe has no idea, and cannot understand, and thus, does no object.
Google is doing to our society, what the new settlers to North America did to Native Americans. Offer them beads, and plets, in exchange for riches, using our own ignorance against us.
Google is a primay example of the "slippery slope". They were given an inch, and they took us out back, and beat us with a 2×4.
If you trust your business to google, you're nuts.
And to the comment I replied to, yes, it is all for tracking.
Edit: yes OK I admit I don't like Google, just to ensure my bias is clear.