You're assuming it was originally his marketable idea.
Even if it wasn't he still made it work and built it into an empire. So there is at least some ingenuity in that.
But. I don't like it when people use large platforms to stifle individual liberty like that. If he cares so much about the poor, why doesn't he use his own wealth to the fullest extent to relieve the poor, instead of trying to use other people's money to relieve the poor? With his wealth he could give 2.1 million people a living wage for one year. But he wants to take my relative pittance to do it? I say put your money where your mouth is and let me decide how and with whom I will be charitable. Charity is an individual act. If it is a collectivist act, it's really just wealth redistribution.