Given the popularity that Bitcoin has already gained and the popularity that will be in the future, it is simply not safe to remain a public person, personally for Satoshi as well as for the entire Bitcoin ecosystem.
If someone really knew him in real life, its just this someone that knew him he is somebody. This someone who knew him can't even provide a prove if he really is satoshi.
Almost every day a new person comes up with the claim that he/she is the real Satoshi. The real satoshi surely does not want any kind of fame. If he/she/they want fame he could have disclosed his identity earlier. But what could be the possible reason that Satoshi still hides his identity? Does he have a big plan for the future?
the concept of bitcoin is to become anonymous maybe satoshi really want to hide his own identity that why he creates bitcoin
there is also some possibility that he's dead because the coin that he owns is not even moving.
Maybe that is the first reason as he wanted to do this concept of anonymity, but I do understand that we all wanted to know him well as we wanted to thank him for what he did and we know that it's not an easy job for him to do this kind of creation, for sure it took him years before he finally developed it and he sacrifice a lot of things for this to finally happen.
He probably had developed BTC long before the 2008 financial crash. And since he knew its going to happen once again over and over like a pattern it did in the past bubble. He spread out blockchain to prevent it from happening again and again.