It's very much with their permission. They have even signed in just to be able to write the review with their real name and photo.

WTF? What review system, exactly, doesn't link to the reviewer's profile -- permission implied by posting? It's not even a generalism; it's a fact, full stop.

I seem to remember that some review system allowed the use of pseudonyms or anonymity. In fact, here is a random example from Amazon:

http://www.amazon.com/gp/pdp/profile/AG48K5RA3M4FK/ref=cm_cr...

Who is Joe? I have no idea. I still find Amazon reviews useful though. I've long refused to rate or comment on apps in the google Play store because of their real name policy. I would do so anonymously though.

For me, it's simply that I don't feel comfortable with the world knowing so much personal information about me. What sorts of hobbies I have, restaurants I frequent, etc. It's really a massive privacy problem. So I no longer review products in Google's system.

"My God! That review I posted publicly on G+, the one associated with my real name G+ profile, is visible on the Internet!"

If you write a review, then someone searches for that place on Google Maps, your review will come up on the place page--with your name and picture next to it, now less! It's... not really much different, except that this is being used in ~~ads~~.

Presumably, if you wrote that review on Google+, those would appear by the review anyway?