I’d say doing something because you believe in the good of it, and not because you think it will be materially beneficial - being selfless. Ego aside and the betterment of humanity on the forefront - like Satoshi with Bitcoin 

 Was satoshi altruistic?
Thats a intresting thought experiment  

 I think so 🫂 does he touch his bitcoin? I heard he doesn’t, but I could be wrong. Also, starting something and then leaving it to the people to continue, without claiming that you started it. That’s rather beautiful. 

 The thing he created can and is used for good.
But no one knows his true motivation except him. I tend to believe his motivation was good but who really knows