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There are many more public DNS servers out there, too many to block.There is a nice comprehensive list here:

You might also be interested in https://dnscrypt.eu.

They mangle all udp port 53 data.

Actually not all port 53 as there are some DNS servers still accessible and actually resolves stuff fine.

No, there's no mangling of data (apart from HTTP which gets injected with a RST flagged packet once in a while)