Filing a simple John Doe summons in your home jurisdiction and then sending a subpoena to YouTube for the offending contact information is pretty trivial. You could probably find someone to do it for you for a thousand bucks or less.
Admittedly that’s not free but in a context like this with real money at stake it’s not a huge obstacle.
You might have trouble getting the opponent to cooperate but if your ultimate goal is to get YouTube to do something then that could work just fine.
Again, clearly legal action isn’t easy but people seem too inclined to throw up their hands instantly.
Learning how to take basic legal action is just a core part of running a business, and someone earning from YouTube at this level is indeed doing just that.
My (and the GPs) question was: let's say, following the filing of the requisite legal documents and the accompanying fees if any, you receive the contact information of the claimant from YouTube. You are in Germany. The claimant's address is in Turkmenistan. What are you meant to do next?
Why have we made it so easy for crime in this country.