Countries can accumulate Bitcoin to become whales. They would be laying foundations for future generations to have an improved way of life than their forefathers. Only in future if their BTC has fiat value will we say it was successful gamble but more countries would have to legalise Bitcoin as a tender.
It won’t be bad for them to accumulate more bitcoin but the thing is they are even among the lowest Bitcoin holders among countries which hold Bitcoin even as they made it a legal tender, their resources won’t allow them to have much more compare to what other countries have acquired through seizure, price increase is not only attached to countries having more bitcoin, as that have more negative effect than positive one.