Show me people that are directly helped by these "philantropists" and I'll tell you if I think they are doing "charity" or not. Charity like internet.org is scam.
I listed some causes I think are valuable in the interview, but in general I think GiveWell and ACE are good evaluators:
* http://www.givewell.org/ * http://www.animalcharityevaluators.org/
For each charity they recommend, they have estimates of number of lives saved per dollar.