should SHTF actually happen, these gazillionaires are quickly gonna find their staff revolting and taking over; at a minimum, there would be a civil war between pro-gazillionaire and anti-gazillionaire factions ...
gazillionaire fortresses take a formidable staff to run, particularly all of that extremely high-tech security stuff ... and then of course, sooner or later some critical resource like food or energy that is critical will run out, or some part that makes the whole thing run won’t be available ...
at best MAYBE the gazillionaires could survive the initial stages of SHTF, but after that, when they can finally poke their heads our of their fortresses, they better personally be able farm and shoot ...
Those gazillionaires better hope they have VERY loyal staff who will protect them instead of shoot them and then move into the nice accommodations they were guarding for the rich ingrates.
My father got shot in the abdomen in Philippians during the end of WW2.
It wasn't the bullet that almost killed him. It was the infection in the jungle hospital that sent him home on a hospital ship. Six weeks in the hospital from the infection.