Looking for reliable (ddos protected, daily backup) and fast (64x3,3GHz, 4x1tb nvme ssds, 128g ddr4 ram, 1 gbit conn) Nameservers in Germany?

And that for free, with dyndns and low TTL?

Then have a look here:
https://coredns.pro/

On registration, you'll be given a long password with which you can manage or delete the zonefile. Alternatively you can add a mail on registration to be able to have your zonepassword recovered.

Todo: A design, more flexible Zonemanagement and automated DNSSEC!