So you're not actually questioning the act of giving away the money either? Your point of contention is "Why is he posting this?" ?

That's actually quite an interesting line of inquiry. I'd suggest it probably helps raise his company's profile, it helps draw potential employees to his company, and, admittedly, it also probably makes him feel good about himself - and it should - he's doing a Good Thing (TM) he should be able to highlight that. It cost him $3MM why shouldn't it buy him some goodwill?