Ah that’s a good catch. I don’t think they’re even a formal book provider yet, may need a post in the Book Providers Megathread (Official Management) thread.
Also, as a general ask, I think we’ll always want one free graded reader series for each language, similar to Tadoku - Free (series) | L0-19?? for Japanese or 두루책방 - Free (series) | L0-20 for Korean.
Not only do those sorts of things serve as an awesome resource for beginners, but they also set a standard for the difficulty rating system for levels 0-20. If anyone knows an equivalent for German, let us know! 
