The chances of you finding out were small. It's good you did because he's probably gotten away with using a lot of people's articles from Medium. You've done us all a big favor. We can check it out. I read an article here that Joel Stein wrote about his work being stolen. He's written books, articles in big publications, and had a steady gig with Time Magazine. He got an attorney and everything and finally gave up. These guys are hard to catch and harder to prosecute. It's a real black mark on this dude if we ever find out who he (or she) is.