I think there are two separate situations about the DeX first is that DeX meaning is a Decentralized Exchange meaning it should be free from manipulation and control by a central authority, and also DeX was created as an alternative for CeX or centralized exchange, But due to the changing crypto regulation and landscape, some DeXs are just followed and comply to the centralized authorities so they can continue to operate especially now that the crypto adoption is going to the mainstream DeX's has no choice but to comply the regulations or else they were shut down.