Doubleplus
Member
What we're talking about here is where people buy tickets for short journeys to get through barriers; these could cost a tiny fraction of the actual ticket price. Then they have a much more expensive ticket for the actual journey made, which they fradulently claim a refund on.
Doughnutting isn't easily represented by analogies for other scenarios; there isn't really a comparison with any other industry that I can think of. The Halfords analogy doesn't work for this at all.
In fairness I think the question is rather wider, the general question of whether Trainline are 'assisting' with fraud investigations by examining passengers' travel details (whatever they may be - wrong railcard, short faring, wrong type of ticket, wrong time of day, etc) and proactively bringing those to the attention of their commercial partners, rather than having been legally required to disclose such information after the detection of an irregularity.
One thing for XYZ Railway Operating Company to approach the Trainline and say "We have reason to believe that Person X who purchased a ticket from you has done so in an illegal manner and we therefore require all the information you hold about this person so that we may determine if it has happened before", and for Trainline to say "Our whizzo database has identified 180,000 possible irregular journeys which we would be happy to provide details of, for a fee, or a share of the fines."