Have we any evidence of that? Accepting that not everyone who gets a rude letter from the railway comes to us for advice, I don't recall seeing any postings here which say 'I have never fare dodged in my life yet the railway are threatening me with prosecution on the basis of my Trainline record'*. Rather, we see posts which say 'I have been picked up for fare dodging <which may or may not have been resolved out of court>: now the railway are looking at my Trainline record and accusing me of fare dodging in the past'. So the railway are using
@Haywain's (I think - I haven't scrolled back to check) test of suspecting people who are already proven fare dodgers and seeking whether there are other past instances which might amount to fare dodging.
*I suppose we do occasionally see these. But in fairly short order it emerges that actually there was an instance of fare dodging - only in their view, they're a special case and it wasn't
really fare dodging so why would the railway think that it was?