While bouncing Copyright around, don't forget about search engines and site scrapers. For example the BigResource site has little original content and publishes everybody else's content to display ads and Google ranks them better than the owners of the content which will no doubt be protected by Copyright.
Over the years I have seen lots of new services emerging that track images, register and monitor pages and content and so on. Lot's of people have tried them and in the end realised that it's all a waste of time. I think that the original developers of image tracking faded away after only a couple of years. That was back in 2000.
Prosecuting offenders is also a waste of time and the majority of them will more often than not turn out to be backyarders and suing them wouldn't even get your solicitor paid. That's if they stay in one place long enough to be served.
Solicitors want to be guaranteed payment and will want to be paid up front, especially for a Copyright case. How do you get your money back when they serve a fictitious address or find out that the site owner was a minor?
People wanting to protect their craft and their livelihood will always be a minority and they will always have formidable opposition.