The point is not that Google cares about those sites - they don't. Those services are leverage that they use to control web standards, in order to enable their real cash-cow: AdSense. They will use their web properties to shove down our throats anything that makes AdSense more profitable, from the anti-adblock measures in Chrome to this one.
> If we're all dependent on them enough that that's a problem for us, then that dependency is the problem
I don't disagree - and I use Firefox, keep my important mail outside of Gmail, etc etc. But I recognize that many, many people don't, so the technologically literal out there have an ethical responsibility to push back against corruption of the open web.