Rich people are buying gold and Bitcoin to protect themselves if the dollar loses its power.
To some extend, sure, but they don't even have to given that the rich not only pay proportionally fewer taxes (and even fewer now, given the recent policy changes) but also often are first in line when receiving subsidies.
The dollar may fall, but if you're up high enough you won't care because you can make up for it by extracting even more wealth from the middle and lower classes.