What do you do?
One of the great questions, and one which has many answers, few of which seem to actually work.
One of my sites which has interest for scapers is generally left alone... I have it set up on old style FRAMES (not IFRAMES) and that's just a bit more work for the suck it quick scrapers. I do not recommend anyone change their site, though I will say that both Bing and G can read FRAMES just fine. That site averages about 1M real human hits a year... might not be enough for an eCommerce site, but does okay for that niche.
Meanwhile, set aside an hour each day to DMCA... as high up the chain as possible to reduce the number of steps toward satisfaction.
Also, spend a little time in the Spider Identification forum [webmasterworld.com
...] to determine where the bad actors reside and how to put the kibosh on them. There you can also learn about whitelisting robots.txt to take some of the heavy burden off, and how to block countries by ip.
There will always be those who take what others create, which is one reason why all
countries have some kind of Patent and Copyright laws, else the creators will chuck it in, with good reason.