As far as I go I think that these people just simply want to be famous and for that, they simply try to be Satoshi Nakamoto because they know he is the most knowledgeable person as he developed the blockchain and bitcoin system and gave them to the world. But these person does not how risky all this and as we all know satoshi is anonymous after some time of Bitcoin inceptions and maybe he did it just for the purpose of saving if he is knowable then he will face a lot of cases the banks, from the financial companies, from the individuals who lose their money in bitcoin, from the government to funding or use of bitcoin in illegal activities or maybe some persons target him just to steal his bitcoins. So in the possibilities of all this be he wants to stay hide and if some person wants to be stasohi and his claim is right then I think he will go all these throughs. These are just a few there are also many other cases through which he will go if he is knowledgeable.