The idea is to push people to use the train, but a train isn't an alternative if it takes 9 hours compared to the 2 hour flight.
And your 2 hour flight easily goes to 4-5 hours if you add the security theatre and the extra overhead that transport to/from the airport entails. They are far outside the city whereas central stations are usually in the city center.
Tourist&foreigners can use the Deutschlandticket, too.
But: it's a monthly subscription automatically renewing every month, so one has to cancel it early enough when planning to leave the country. You'll also typically need a smartphone for the ticket.
"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)
The €9 ticket was a 3 month temporary offer, which was not originally intended to continue permanently at all.
> I LOVE the German transit system (although Denmark wins in cleanliness). However, Germany is a bit predatory with this new system. You can ONLY purchase this ticket as a subscription model. If you’re a tourist, you must cancel before the 10th of the month or you get auto rebilled.
The ticket is subsidised by the German government(beyond the amount that all rail infrastructure and most services are subsidised) for the purpose what is covered in the article - encouraging permanent modal shift of regular travellers(primarily commuters) from road to rail. If you're a tourist, it's not meant for you. Sorry.