What are anonymous crypto exchanges?

Could you elaborate on the concept of anonymous crypto exchanges? Are they platforms that allow users to trade cryptocurrencies without revealing their identities? If so, how do they achieve this level of anonymity? Are there any specific technologies or protocols that they utilize? Also, what are the potential risks and benefits of using anonymous crypto exchanges? Could you provide some examples of such exchanges that are currently operating? Additionally, are there any regulatory considerations or legal implications surrounding the use of anonymous crypto exchanges?