I joined just to answer one question. Is this guy committing sin?

I joined this sub reddit to answer a single question. As you can see in the video above this man is showing us a book that he created. It looks pretty cool doesn't it? Well what if I told you that wasn't his book and he stole it from another creator to profit off it. The question I wanted to be answered from other Christians. Is this guy committing a sin or sins?