(Of course there are other Google-wide policies (e.g. egregious spamming, illegal activity, etc) that do apply to all Google products, and violations of these policies could in fact lead to a Google-wide suspension.)
So don't post about your favorite torrents site that violates copyright law. Or if you're like me and live in Illinois, video tape a police officer because that violates wire tapping laws. Yes, I know I would be in violation of this policy if I sent an email from gmail about these things, but I'm guessing I'm more likely to get caught if it's on g+.
Keeping my gmail account active is worth far more to me than any potential benefits of google+ at this point.
In any event, the down votes on the grandparent were uncalled for.