People reupload my sims to the Gallery and put CC on..:-/(still with my name on it!)

Once you upload to the Gallery, it is no longer yours; it is the property of Maxis.

Anything you upload to the Gallery automatically becomes the property of Maxis; uploading custom content on the Gallery, even though it does not transfer (unless you have the same piece in your Mods folder), technically becomes the property of Maxis and is no longer the property of the person who has created the piece of custom content.