Discussion on answer by gerrit: How to purchase Sparpreis ticket without disclosing personal information?

Not being informed about an earlier departure is not necessarily a great problem. If the departure time changes after you have booked the ticket, the tie to a certain departure is lifted and you can use your ticket on the next or any other departure instead.

@gerrit: How can DB prove "passenger missed the train due to fake contact information" when there are a million other reasons that the passenger can't simply "leave 10 minutes earlier" even if told to do so?