Not really. The true decentralized currency can never be regulated by the government. The only way they can regulate crypto currency is through an indirect way. The government can take control (regulate) those centralized exchange, wallets and crypto currencies. So anyone as long as they are not using those centralized institution or interacting with fiat currency will be able to evade those regulation.
Indeed. Since it is decentralized, cannot be regulated by the government. But DEX can be regulated by making some regulations for them. And the government also can apply crypto taxes both for payment purposes and for investment (digital assets). Although the government cannot fully regulate crypto with this policy, it can bring effect quite a lot of crypto users. The government may have no power to regulate crypto world, but they can regulate the use of crypto in their country.