alt Hacker NewsContinental USA: 8 million square kilometer.
Germany: 0.35 million square kilometer.
On the point of the upkeep, locals know German trains are now legendary for unpunctuality and cancellations, so maybe it's not working. But the answer is obviously (trigger warning for the libertarians...) taxes.
The ticket came about because energy prices went crazy after their energy dealer Putin went crazy and warry, I think it was an attempt to motivate people to take public transport rather than have them moan about fuel prices going way way up...
fyi regional trains (which the deutschlandticket is valid for) are very punctual, it is the long distance/ICE trains that are always late/broken, and you cannot ride those with thw deutschlandticket anyways.