these things are strike me as greater-fool schemes. everyone hops on thinking they are probably ahead of the curve, and most of them are suckers. what a funny game- the skill is knowing how many other people will go for it.
In addition many governments try to move citizens to "electronic payment" (ranging from online banking to NFC credit cards). The reason is once again tracking, and as could be seen during the financial crisis it's easy to just confiscate money when it's just numbers in a mainframe vs actual piles of cash in my home safe.