If SHTF their staff will do them in.
Day 2, billionaire is on the menu.
I think that is an interesting point. You might own the yacht, but you are hostage to the staff that run it.
You’re better off with a well prepared island that you can run yourself. Minimal technology.
If they're smart they will include the staff and their families in this. The only way to insure loyalty.
If your wealth is in paper or buildings getting torched, the bolt hole is only valuable if you remain lord of that castle with the loyalty of armed guards as your military and dole out limited supplies as your remaining source of power.
If you had lots of wealth on paper and a bolt hole like Vivos, your family may survive (which is not to be knocked), but you aren’t wealthy afterward.