"One day everyone will use China's digital currency"
You think patriots would let that happen?
(Note that BtC has popped almost x6 since about the exact date this article was published last September. True, the fiat dollar bloated, but by nowhere near enough to justify even half of that move.)
You can buy silver bullion online without giving your bank account # or credit card info. There are also many subscription based web services that accept it. It’s more common than you think