Listened in Spotify but came to comment. It also makes me sad when people criticize "billionaires playing with rockets". To me it seems like the most exciting inspirational thing we could use any amount of money for. They could be buying private islands but instead are choosing to gift the human race with new possibilities of exploration. It is sad that anyone can criticize someone working for a bigger future. It is more exciting that we can even go to Mars at all. It is exciting we get new technologies and knowledge. I can't imagine a way any billionaire could spend THEIR money that is a better gift to us all.