I went to Germany by train. At the first German stop, the train was declared “not up to DB standards” and cancelled (sold for scrap, I assume).
I mean, the train was exceptionally terrible, unlike any I went by with ČD. People were crammed in 3 coaches instead of 4, there was no A/C and the doors between coaches could not close, so I leaned on my luggage and held my bike propped up against a handlebar at the door I entered, all in noise such that people needed to gesture or show each other notes on phones. The train was apparently German-made, though.
However, way better trains get routinely rejected by DB. Why not just say „auf eigene Risiko einsteigen“ instead of „Raus“ and get people to their destination?