Maybe. I just don't understand why European developers didn't start by forking the austrian app, which has an apache license. The Stopp Corona app is developed

Maybe. I just don't understand why European developers didn't start by forking the austrian app, which has an apache license. The Stopp Corona app is developed by the Austrian red cross and has already been successfully deployed and used. There's a lot of experience around it. Why not begin with a fork and add your own requirements? Then slowly try to merge those upstream? Now the landscape is fragmented from the start. It's NIH all over the place.