Honestly why even ask the question or read the ToS when you know the business model of Google?

To be clear Google is NOT a technology company! Google is an advertising company which, unlike traditional advertising companies selling physical ad space, sells online ad space. Through vertical integration they also happen to distribute software, e.g. Android, Chrome, etc, services e.g. Google Search, GMail, GDrive, GCloud, and hardware, e.g. Pixel, Nest, etc which they are not giving for free but at a low price, and infrastructure, e.g. Google Fi.

... but ALL those products are ONLY existing to sell ads!

I let derive your own conclusion for Google Fi and every other product they provide.

TL;DR: of f*cking course.