[dietr1ch]

Well, on mobile they make you think you need the app, but it's region locked. I happened to email them about how this is annoying for tourists yesterday and got a very German response,

"Downloading the Deutschlandticket.de app from the Google Play Store and Apple App Store is only possible in certain countries." (ikr, it's THE problem)

[layer8]

The problem may be that if they offer the app in foreign regions, they are liable to the jurisdiction of those foreign regions.

[Aeolun]

Is a response repeating the thing you just concluded in your mail to them very german?

[Zak]

A factual, but entirely unhelpful response to a customer service query is very German.

[lispm]

The ticket is available by other apps, too.