I wonder what personality you have to have in order to acquire 8 billion and to give it all away. It must be a mix between a ruthless businessman, and mother Theresa. Never met anyone like that.
Of course most of them also like to live very comfortably and spend it. I guess once the $$ has a B in it maybe it becomes essentially impossible to spend it all and the money a theoretical concept at best.
Good for him to give back in the most selfless way.
Imagine your software got you to $5B, you can give away $4B, but you can also continue to grow and become a semiconductor superpower.