Google's new motto: "Don't be evil, but only after trying really hard to be so, and then grudgingly accepting that perhaps your users have alternatives that they might avail themselves of, and capitulate" It's not as catchy, but perhaps a little more honest.
Your system of morality has an astonishingly low bar for "evil" if "requiring a Google+ account for access to a service" qualifies. I don't think something that harmless would go past "somewhat dickish" for most people. If that's evil, what's the word you use for people who kick puppies or otherwise cause harm to the world?
Whether that qualifies as "evil" is semantics, but excusing it with a comparison to puppy kicking isn't valid. It's a fundamentally different kind of issue and requires a fundamentally different kind of reasoning.