Article Rewriter is a software or a human ran service that rewrites articles for you. Before the development of Machine Learning and Artificial Intelligence, there were humans that used to provide this service. There are some human rewriters out there today but they are not efficient. There are tools like WordAi(https://wordai.com) that uses artificial intelligence to understand the text and is able to automatically rewrite your article with the same readability as a human writer. WordAi rewrites articles within minutes (if not seconds).
Think of it this way: What do you have more chance of hitting, a distant, tiny target or the broad side of a barn? For the sake of search engine optimization, you want your website to be the broad side of barn. The more quality articles, or unique readable content, your website or blog offers to search engines (and therefore the general public) the more exposure your website will receive from major search engines.
Spin Rewriter integrates with almost any SEO software. This allows you to post high quality articles quickly and easily. The only drawback is that you only get something like 300 API requests every 24 hours. You can quickly burn through this if you’re doing multiple campaigns. The developer does not currently offer a plan for heavy API users but maybe they will in the future.