I've (okay, it wasn't entirely me) found yet another SCRAPER site, and have reported it to Stack Exchange through the standard route. This scraper is somewhat exceptional in that it's scraping a majority of SE sites in near-realtime. I've discovered a lot of my own content on the scraped site.
Since the terms of the CC BY-SA 3.0 license aren't being followed, under section 7 of that license, the scraper's license is terminated and the rights granted to them under it are revoked. Hence, to them, the work they're holding is copyrighted and they have no right to use it.
Is it okay from a SE perspective to send them a DMCA takedown notice for my own content? It seems that I'm legally within my rights to, but is this something SE would prefer we didn't do so that when they're contacted by SE there is more stuff there to work with?