For me, it is because there is an expectation that my data will pass through the telecom. Not only is it expected, but as the end user I have little choice in the matter. If Eve wanted to inspect my traffic, that is a one-stop shop.
Flywheel ends up masquerading some of that traffic, so if for no other reason, it is atypical. I also perceive that it would be in Google's best interest not to abuse that privilege since advertisements are how they make their money. If they abuse that privilege, consumers will go elsewhere and they will lose their market advantage.
You only need but look at the cookie tracking the telecoms are doing right now to see that their oligopoly gives them little incentive to respect consumer's privacy.