The Tube sites make their living from theft; they upload other people's copyrighted content to present as a lure to site visitors. That's a problem outright because ultimately this destroys the source of new content.

It's also disturbing because it relies on the fact that nobody will protect the rights of lowlife pornographers. Lowlifes have rights too. Protection of the rights of the despised is an important bulwark against infringements of the rights of upstanding citizens as well.