The very nature of cryptocurrencies dictate that regulation, control, and by extension, a centralized system, do not fit in with what they stand for. They are supposed to be totally decentralized, and therefore not dictated by many rules.
This made a lot of sense when cryptocurrencies were not in the spotlight, and not a major factor on the world stage. However, as mainstream adoption has increased, and more individuals have entered the market, so has the interest from governments and regulators around the world.