Yep, I'm sure it's the brilliance of Amazon and not the same old trick of creating a monopoly then exploiting it that people have been using since the early middle ages and regularly outlawed because it destroys economies.
Say ... what was Amazon's initial reason for success? Being cheaper by exploiting the interstate commerce clause to avoid paying sales tax when it's competitors weren't allowed to do so? You don't say. Amazon is famous for losing money on their delivery business (up until recently)? It's constantly repeated in 10+ years of their financial statements ...
So either Amazon has completely changed tactics and become truly brilliant and we still don't understand the plan ... or they're up to their old tricks, being slightly cheaper, now with less legality!
It's illegal under German law, EU law, and I'm sure it's also explicitly called out as illegal in at least 5 trade treaties Germany signed.
Needless to say, like everything in the EU, it's only enforced against local companies, in this case German ones.