No what it is, is cookie stuffing. He's hoping you dont catch the image, what it does is plant a cookie on users machines, who then if they sign up for something he gets credit for the sale and makes money.
You should just remove all his posts and ask him not to come back by banning him. Any post with 1x1px images, or images that don't appear should be removed.
If an image appears then its probably not cookie stuffing.
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