People don't need an incentive to upload disgusting or illegal content. They do it all the time just to annoy others. I built and ran a very small web app as a

People don't need an incentive to upload disgusting or illegal content. They do it all the time just to annoy others. I built and ran a very small web app as a joke for a party, where friends could upload pictures of themselves drinking a beer. When I remembered it existed and went to take it down a year later, someone had registered an account and uploaded about a hundred megabytes of gore: images of dead or injured people. Other friends have had the same problem with actual child pornography.