The mentality of "copy cats" is that if someone is successful in doing something, why don't I do it too. There's an audience that enjoys that content, why don't I make the same/similar content, and put more out there. You can see examples of this in real life. Why do both Walmart and Costco exist? Isn't Costco just a copy cat, since they both pretty much sell the same/similar products? Yes. Despite Costco being a "copy cat", they still succeeded as a business because there was enough demand in the market for them to co-exist with Walmart. Sometimes "copy cats" create the same content/product because they feel they can make it better than the "original", so they create the same/similar content, but make improvements. It's called competition, and competition is good for consumers, in our case, the viewers.