[cduan]

The reason for setting up a DMCA takedown policy is precisely so that the site doesn't have to deal with copyright infringement: by doing a fairly minimal task of responding to takedown notices, the site operator gets freedom from liability for pretty much any related copyright infringement lawsuit (which otherwise could cost a lot of time and money).

It's pretty easy to set yourself up with such a policy, and anyone running a site that includes user-provided content should have one. EFF used to run a startup boot camp that went through all the steps of how to do it, and if they still offer it I would recommend it.