What if all those big corporates and businesses starts using crypto as a mode of payment just to avoid tax which will cause a direct loss to the government which uses tax for the betterment of the country. This might not affect corrupt countries as it doesn't matter because tax money goes to politician's coffers but what about developed nations?
Just by having the fact that no country has ever regulated cryptocurrency massively yet, we can already say that all our assumptions are just theory coming from what we see and most of it are biased. We would usually say that it will give great advantage and a boost to the economy of a certain nation but things may turn out badly soon after the implementation of its regulation. Crypto is a decentralized currency which avoids any form of corruption but if the government would have a hold on it, things may go the way we don't want it to be.