[naravara]

> but what's wrong with funding homeless shelters or schools?

You don't get to be fabulously wealthy without some of the second order effects of your wealth accumulation being unsavory. Generally speaking, these people will do things like run out competition, foster massive economic inequality, and perpetuate labor abuses to pad their bottom line and then buy the indulgences by doing a cosmetically "good" bit of philanthropy. But they probably could have done more good by doing their day job in a less exploitative way.