A scraper site is a website that copies content from other websites using web scraping. The content is then mirrored with the goal of creating revenue, usually through advertising and sometimes by selling user data.
You may be a plagiarist and not know it. What appears to be a 'trick' or work-around is in fact still a form of plagiarism. Check out the different types of plagiarism here.
Unless you have the time and money to search continuously for similar post titles in Google, it is not easy to find sites that are "stealing" content. To give you more the ability to know what websites are scraping your content, here are resources to get it done.