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Yeah, from the comments on the blog: "The German market would be Germany, Switzerland and Austria. That's over a hundred million people. Works for me "

German speaking market is big enough and rich enough to solely focus on it+less competition compared to English speaking countries.

And yet the blog article is in English and it was promoted in an English site (hacker news :)

The "blog" article is in English because it's posted in an English speaking community (who are presumably more interested in the story than the software itself).

It's "promoted" on HN by someone other than the author, it seems.

No, wasn't me. I actually decided against posting the link here.

The blog is about the author's experience not about the software itself