These countries have a tactful reason for doing so, and this reason is directly tied to the anticipation of the inevitable end of US hegemony.
Central banks are among the largest purchasers of gold. So far in 2019, they have bought 145.5 tons of gold, which is more in a quarter of a year than central banks have purchased in the preceding six years. To put it bluntly, this figure represents a 68 percent increase from the year before. Last year, central banks increased their reserves by 651.5 tonnes compared to 375 tonnes in 2017. Reportedly, this is the largest net purchase of gold since 1967.
Most interesting, however, is the class of countries that we find are turning to hoarding more and more gold, many of which are deemed to be adversaries of Washington.