According to the policies it puts up on its own website, Amazon prohibits the sale of items that “promote or contain materials or activity that is hateful, harassing, harmful, invasive of another’s privacy, abusive, or discriminatory (including on the basis of race, color, sex, religion, nationality, disability, sexual orientation, or age).” This would seem to rule out Breitbart and 8chan. But when asked about the apparent contradiction, the company did not respond to a request for comment.