Good information. I guess I have always figured that any pictures I post are up for grabs in the semi-public domain. My other hobby is restoring old Voyage to the Bottom of the Sea toys made by Remco back in the 1960's. I have to admit I was a little surprised to see some of my eBay pictures show up on a toy collector website, but even then didn't really care. I was happy to share.
I see what you are saying, though, that someone who is a professional photographer or otherwise doesn't want their images shared or used by others for profit need to go a more secure route.