Reminds me of the time when I was in Leipzig in late 2018 (at CCC) and I tried to sign up for CleverShuttle. Turns out they had a bug where they could not register using an American number. The app just silently fails and I was left stranded late at night. I tried to use their support line to get help...turns out its an email address and they responded to my inquiry with generic steps to try again....two days later. Luckily a friend was kind enough to give me a ride home. I don't know how Germany manages to write such a garbage app but its their prerogative to chose a lower standard of service compared to the US. I always dread some things about visiting friends in Europe and the quality of service is always one of those things.