I had no idea either. I always associated it as being a European chocolate, especially since it's basically impossible to find in the US outside of import stores.
Europe is not lacking at all in good local chocolate brands though, so it should be a no-brainer for replacing US brands.
Though I'd hope that they also work more on obtaining ethically-sourced chocolate beyond the base requirement of not being American-owned, since the global chocolate industry as a whole has a lot of problematic business practices such as the tacit support of slavery and child labor.
I think it gets tricky trying to support multiple causes. If you've watched the Good Place you probably know what I'm talking about, but if you try to do everything perfectly all the time, then you're just going to be miserable agonizing over every decision. I'm starting to think that it may be better to focus on causes that are higher priority to you and do what you reasonably can for lower priority causes where you have the bandwidth for.
Reducing child labor in cocoa farming requires legal changes in Ghana as to how you purchase cocoa. Currently everything is bought from brokers who can obscure the labor practices involved.
Feodora Edelbitter Sahne (IDK what the international name is) is really good if you like higher cocoa content (it's milk chocolate with 50% cocoa IIRC). The company seems to be Danish.
Also Tony's Chocolonely, it's fairtrade and from the Netherlands. Love the caramel one.
Ritter is absolutely amazing, so long as there's no marzipan. Tried one with marzipan once, my first experience with marzipan, and I absolutely hated the marzipan. It's one of the few food related things I absolutely hate the taste of. Otherwise, they are perfectly acceptable to me.
When my father was young, he used to live close to a chocolate factory. Built during communism, privately owned by a local company following the collapse. I looked it up out of curiosity.
It's now owned by fucking Nestlé.
Makes me wonder if there's an EU manufacturer of shaped charges.
Definitely not less chocolatey than OP's Prinzen Black and White or Corny bar. And it's been a while, but I'm pretty sure it beats Ritter Sport Alpenmilch, too.