Recently I have came across these fake writers. Here is what they do:
copypaste an existing article, change most of the characters to non-ascii ones, that look like exactly the ascii pair of them. Plagiarism checkers will not recognize this, so you might think that you get a unique article, while you only have some rubbish string of characters, that looks like real text.
beware, and check your articles with an escape tool as well.