We've seen for centuries what bored oligarchs do - they lead crusades across nations states for one bullshit reason or another with an legion of people who need to work with them for money, entering into indebted servitude agreements. They get bored and go to war. Apparently building and inventing isn't another - I suppose because most of them are incabable of doing that due to a lack of talent. It's not so fulfilling being the moneybank with other people do the hard and interesting work. Probably why billionaires like Gates are midly normal compared to most - he's talented enough to do the building himself if needed. Same can't be same for Musk and Trump.