Why doesn't Bill Gates, Warren Buffet, Jeff Bezos and Mark Zuckerberg donate hundreds of millions of dollars to North Korea to provide food?

Because they would be considered traitors.

Tell us, Einstein, how can someone give money to North Korea without the orange shitstain traitor Trump's lover Kim taking it all?

Sucking up to dictatorships like North Korea is more of a Republican thing. Maybe Trump should send Kim Jong Un a check along with his next love letter?

Because the government is corrupt and would spend the money on more nuclear weapons  probably.

One, it's illegal. There are sanctions in place. Two, NK hasn't been communist since 1992 when it abandoned communism as the USSR fell and stopped economically subsidizing NK's communist government, NK's government at that point doing an about-face into its own ultra-rightwing brand of fascism dubbed "jucheism" in which the Kim Dynasty has been deified as a cult of personality whose chief responsibility is to teach the people of NK self-reliance rather than state-dependence, "juche" being the Korean word for self-reliance. 

It's illegal, ever hear of sanctions.