The man could easily maintain homes in wonderful places around the world and do whatever he wants with his life in any of them.
He's not going to regret this for even a minute.
Sure there are plenty of other great places to live than the United States - but his career trajectory seems to be in tech. Thats where he is continuing to invest and put his time. All roads in that arena lead to California - a place he just voluntarily gave up the right to ever reside, work and do business in.
Facebook wasn't even founded in California, for example.
When people in America have a hard time getting a house loan, or have shitty health care, or are living on food stamps, they simply say "Well, at least we are better off than everyone else".
THAT is extremely scary.
I was an expat for close to 7 years, have friends who renounced and thought long and hard about doing so myself. I can say with great conviction that long term, in my educated opinion, it isn't worth it.