It would be best if they could collect or buy bitcoins, because success can only be achieved by holding bitcoins. Because the price of gold has only increased by a few percent per year, but the price of Bitcoin has increased the most every year. In 2024, the price of Bitcoin was close to $40,000 at the beginning, and now the price of Bitcoin has touched $93.4K. Then you notice of course that it is possible to gain five to seven times more in Bitcoin than the price of gold, so the biggest gains from holding Bitcoin alone are through long-term holdings.
I would guess that if they ended up buying it all together, it would not be all that much of a big trouble. First of all, they do not need to buy a full million, they already have a lot of bitcoins as they seized bunch of them, and considering all the situation they are in, we shouldn't really consider this to be a big deal at all, we need to consider this as a better deal.
I am sure that they will always have a lot of money from taxes, they are already spending trillions every year, just military spends 1+ trillion, so 90 billion would be nothing to them but the problem is that they can't buy it all for 90 billion, the moment they start to buy, the price will end up getting higher and higher, and that would be the most important part and would have been a good deal for the long term without a doubt.