ChatGPT managed the following given the submitted source URL. Now let the mass downvoting of this comment begin, because several gods apparently forbid that we use computation to automate drudgery.

Deutschlandticket fraud stemmed from decentralization and weak controls: tickets were issued instantly on unverified SEPA debits, and a leaked or mismanaged signing key let attackers mint valid tickets at scale. Poor revocation and fragmented verification meant many fraudulent tickets still scanned as valid, enabling mass resale and huge losses