DNS server has a very powerful function in network topology. Please keep in mind that it might log your queries (which is a huge information leak).

Further, not all of the DNS servers listed above return correct answers in any case. Some of them return failures for harmful or malicious sites. Check the operators website for more information on this topic.

For security reasons, it is required to use DNS servers which support DNSSEC. For privacy and availability reasons, avoid using just one providers‘ DNS servers.