That's one of the great fantasies in crypto: "The geek shall inherit the earth"
There's no reason to believe banks and governments haven't been stacking crypto. The argument is that it wouldn't go unnoticed and large buys would drive up the price, but a well-run purchasing project could easily handle "small" purchases over a long-term, especially if the goal is control and not price speculation.
Criminals gonna criminal where it makes money.