The strongest signal is whether they use an eBank/app that has a one-click button to report transactions as fraudulent. The Apple card(?) seems especially prevalent.
I think that caused her to over-scrutinize things.
But (years) later I saw her using apple pay. She had charges she didn't recognize and would immediately flag them. Thing is, I couldn't help but think they might have been real charges with weirdly named companies on the transaction.
That's completely the companies fault. If you give a transaction a reference that the customer will not recognise, that's on you!
Whether your bank knows how to use them well to represent your interests is a different matter. For example, I’ve seen banks decline chargebacks against bankrupt merchants in certain countries because they were poorly advised about the legal ramifications, and other banks in the same country win the exact same kind of dispute. Lacking sufficient reading comprehension to parse the dispute rules (it’s a long PDF!) also seems common.