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, 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.
If somebody is Satoshi he can very easily prove that by moving bitcoins from the famous Satoshi Wallet. Nobody to date can do that. It's our responsibility that we must not give any attention to such Faketoshis who can't prove themselves as satoshis.
As you said BSV and bitcoin cash are created by people who are just scammers and it's us who fell victim to them just because of our negligence.
No one knows if Satoshi is still alive. But I assume he is alive and watching the drama that a lot of people claim to be Satoshi Nakamoto. Imagine you are alive and in front of you, Someone pretending to be you. I am sure you will laugh a lot 😂. Still, I don't think he will reveal his identity. If he does, his life will be under big threats because of his money and he has to maintain a lot of things for security purposes. I think he loves to be a normal average person like everyone else. I am wondering, maybe he is living a cool life in a small village or island 😍