What if an exchange or website still allows for sending, buying and selling crypto despite the government making it illegal, can it be called a decentralized exchange??
You're probably misunderstanding the meaning of "decentralized". A platform is decentralized if there isn't a single authority that has power over the platform, instead, authority and decision making is spread out to multiple parties. Just because a certain exchange continues operation despite illegalization doesn't make it "decentralized".