When Jen was young and hungry (as opposed to more seasoned writers, who are old and hungry), this is where she got her start. "The basic format of a content mill is you sign up and provide a writing sample. This sample provides you with a numerical rating, which in turn determines what assignments you get access to. Depending on how well your articles are rated by clients and the editorial staff, you can move up in rank. Clients place orders on a job board, and they can be grabbed in a first-come, first-serve basis by a willing author."
"Willing" being a polite way of saying "impoverished."
There's a reason they're at the top of the Google page: "Most of the assignments are for SEO content, which basically means 'Write some bullshit based around a few keywords squeezed into the text X number of times.'"
That's why the resulting content tends to read the same. It's all coming from the same relatively small pool of desperate writers trying to out-bullshit each other. Which is different from regular writing ... for ... some reason?