He know governements probably want to kill him or want him to work for them so he take the risk to be forgotten forever as a legend.
Imagine what he was able to do in 2008 already, when no one in world have the power to change the world, he was the one to believe he was able to start the revolution alone and change entire world by himself.
Nothing, he predicted everything perfectly, he will comeback one day i think he is already back but to crazy like 10 years ago no one believe him already.
No one knows what's behind in his disappearance after he released bitcoin in public, we also didn't know if he really forget everything or maybe he is watching us anonymously. These are all hunches and theory about Satoshi's disappearance by applying the fact that the Governments hate his invention, therefore we came up with different conclusion to solve his mystery that until now is still unsolved.
If he comes back after 10 years and no one would believe him, he just need to do one thing, and that is proving he is the real deal.