Everything Google does has privacy invasion baked into it. So it's really kinda insulting for them to offer a product where the central purpose is to provide *privacy*. Apparently, the public is not quite as dumb as they thought.
Google has a lot more to lose from a privacy or breach of contract lawsuit than a random shady VPN operation that can just disappear when word gets out that they're actually feeding everything to data brokers, and open shop under a different name the next day.