I just wanted to post an update, in case a search brings someone here thinking they've found a solution to the anonymity issue. Not exactly.
While I'd changed my name to "A Google user," I posted a review of a business on Google Maps. Yay!, I thought, this is great. But then, logged out of Google so I could see what others see, I clicked my name or picture--and it linked to everything I'd ever posted on Google-related sites. They all showed the fake name.
After changing back to my real name, I again checked my reviews--they all showed my real name, including the one I'd posted with the fake name. Ugh.
So if you're looking for a way to anonymously post one review--and I can see many reasons one might want to do that--and then change back to your real name, this isn't it.
PS I wonder what happened to/with @Tmadd59.

I was enjoying interacting with him, and having another old geezer around here, and then he's just...gone...
