I really like your app. I’ve been wondering whether it would be possible to make existing code open source, for example on github.
I know you already put some great effort into it, but since you’re already giving it away for free and probably dont expect to earn money with it anymore, it would probably be a way of giving the people who love your app a way of maintaining it and keeping it in the Appp Store. 
I know, there are some dependencies, but if the public api of Deutsche Bahn is coming, then it would hopefully be possible and maybe your great work for the next Version will be put to good use.

I’d love to hear your thoughts on this.

Bjarne