Pre-war Germany was a huge country full of incredibly industrious people, and despite the Treaty of Versailles, their government retained financial sovereignty.
Greece is a tiny country full of lazy, entitled socialists, and they years ago ceded sovereignty to the European Union.
Germany was able to quickly develop a world-class military, then attack and nearly conquer a continent before being stopped by America and the Russian winter.
The most the Greeks can do is field a few hoodlums.
And if they get violent, they'll destroy the country's only significant industry, tourism.