I don't know if it is ridiculous or not. They're a business and a resource, not an example or moral compass. They're not only competing with the likes of eBay head-on, but they also face the same legal conflicts and potentials as eBay. They want to be a flow-through third party, collect their fees, develop their apps and further their integration (a great tagging tool for Foobar, for example), build value, and all the while not end up on the hook for adolescent shit serious enough to get them flagged by governments and securities (PayPal). It might be censorship, but it is also smart.