That will never happen. Casino Guru still advertises illegal casinos and also earns their money with it. It would be a start not to show these casinos to Austrians and Germans in the first place.
Your complaint here at Casino Guru will be rejected on the grounds that they don't care about the laws in Austria and Germany and you are responsible for it yourself. So you can save your time. It's like asking a tobacco shop to stop selling tobacco. Casino Guru will not even contact the casino, they just refuse.