Several years ago, there were several users who advocated placing the German Roots template on the profiles of everyone who lived in or had ancestors from Germany, but since then the use of templates has been clarified. Project box templates like that one are supposed to be used only on profiles that are managed by the project. It is, however, acceptable to use stickers for purposes like highlighting a person's nationality or ancestral roots. I don't know if there's a "German" sticker yet.
CONFESSION: After seeing your message, Daniel, I looked at your ancestry here to see if I could see where this German Roots template was being used. You have many German ancestors, and I quit looking before I found the branch with the German Roots template. However, I did see that you have quite a few ancestors who participated in the 18th-century Palatine Migration and are eligible for inclusion in the Palatine Migration project. I added the Palatine Migration project box template to some of their profiles. I didn't also add the project as an additional profile manager, but we might want to do that. Identifying profiles of people who were in that great wave of migrants is one of several steps that the project can take toward improving the genealogy of these migrants and their families.