Researched briefly and this was the best I found but I have memories of something even more juicy: https://www.theguardian.com/technology/2015/dec/02/google-ef...
It might be scummy, and certainly risky, but you can hardly say it would be boneheaded to risk damaging a $1B segment to improve an $80B segment.
Never forget: Google is an advertising company. They're not a hosting company, or a SAAS company, or a phone/laptop company, and certainly not a browser company or a mobile OS company. They may dip their toes in lots of areas, but the core is solidly about advertising.
Heck, with how common G-Suite is used in schools, getting kids used to Gmail early would be a powerful argument on its own. Though writing it out like that kind of feels a bit dirty.
Speaking as a long-time G-Suite user the offering currently feels a little lost. It's a bit disappointing considering the initial promise of the product. Aside from personal inconvenience, letting it die would be damaging to Google's ability to sell into enterprise markets.