Scraper spam exists for virtually every website that is even somewhat popular, there is almost nothing site owners can do about it but rely on Google, Bing, DuckDuckGo, etc, to figure out the originator. Google should be able to figure it out and rank the true origin source appropriately, and usually Google is pretty effective at that. But sometimes they're not.

Perhaps what I find ironic is that many of the user "answers" on StackOverflow are basically clone spam themselves, copy/pasted from other websites by some user of the site, usually without sourcing the origin. I have personally found my own unique solutions and code copied verbatim and pasted to answers on the StackExchange network multiple times, outranking my original work without a reference to the origination of course, and I'm sure others have experienced something similar. Perhaps that's what you get with a user generated site, maybe Wikipedia experiences something similar.

Related, some of you may recall a few years back, that StackOverflow basically complained to Google in a public fashion about not ranking well enough and got a boost from them, whereas obviously the average Joe and an average website has no such option nor recourse. Here was the discussion on HN: https://news.ycombinator.com/item?id=2152286