For example, when people started realizing that there were adverse reports about them and their businesses appearing in search engines, online reputation management became a booming little industry in its own right.
And after years of reports about crimes -- sometimes as serious as murder -- committed by people who met their victims via online dating, the sites themselves started being much more rigorous about their own internal security procedures, and promoting this as an extra reason to join. Also, businesses specializing in checking people's backgrounds started to pop up.
Now, in the wake of Google's Penguin update, countless business owners are trying to have the bad links that shady -- or even just a bit careless -- SEO companies built for them located and removed. Many of them will no doubt be seeking out the bad link removal services that existed prior to that major algorithm change. And there are some entirely new ones popping up to meet the demand.
Take this website devoted exclusively to this purpose. It's got next to no backlinks itself so is clearly "hot off the presses". I suspect there'll be quite a few more sites like this appearing in coming months.