An even better response would be, “How do I capitalize on all this free exposure?” For every bit of adversity there are the seeds of opportunity if you can adjust your perspective. How about adding embedded video link to direct viewers to your paid content? Ad sponsors? Newsletter sign-up page? Donations?
You could encourage people to actually steal your content with the right licensing and attribution. Get huge exposure! Offer on-line lessons to others on how to create viral content.
I’ve modified the old saying: If you can’t beat them, join them, then push them over the cliff.