I wonder how a court in Germany can force a DNS provider that does NOT operate in Germany, but operates in e.g. China, Australia, Seychelles, Spain, USA, etc. to comply to the "block DDL-Music" (or any other website).

Perhaps Google via 8.8.8.8 and Clouflare via 1.1.1.1 are used by many, but definitely not ALL internet users.

https://w3techs.com/technologies/overview/dns_server

Cloudflare = 14.6 Google = 2.1 16.7% of the planet is a big number, but it is stupid-easy to bypass this and it wouldn't get them anywhere.