We cant deny the fact that there are really cryptocurrencies out there which was created in order to scam people of their hard earned money.
And i believe government must be able to stop this but not to a point that they will ban bitcoin though.
the only way to stop these scamming is to completely ban them because if governments only stricts a few of them , they can still find a way in order to continue their illegal activities but despite that , there are still country that operates bitcoin and any other crypto related stuffs such as ico or online exchanges because these countries arent strict enough to stop their people from doing what they love.
cryptos isnt all about scamming, cryptos do also have worth and importance , that is why people still continues to use and support it.