Ha. I was about to comment about the School Nature Challenge Schleswig Holstein before I got to that part of your post. ^^
I have noticed it yesterday due to unusually many ladybeetle observations from that area.
The students are adding so many observations that just setting the place filter to “Schleswig Holstein” will show almost exclusively sncsh observations on the first few pages. It seems to be quite a popular and widespread school project. They have found some cool species already as well. :D