Well, people claim to be Satoshi Nakamoto because they want the advantage of the popularity of Satoshi Nakamoto. Take Craig for example, There are still a lot of people who believe that he is the real Satoshi Nakamoto. At this moment, If Craig announces that he is going to create another crypto. For example, Bitcoin lite. There are a lot of people who are going to invest in that shitty project. That's how Bitcoin Cash and BSV have been created. The only thing is, they want to take advantage of the popularity of Satoshi Nakamoto. Most of their target/aim is to scam people. I am not sure if there is another thing behind claiming to be Satoshi Nakamoto.