Out of curiosity do you share the suspected fraud with law enforcement? At that amount there are probably too many to chase down so I’d think this is just an unprosecuted crime?
Generally the bank will file a Suspicious Activity Report (SAR) with FINCEN for egregious cases. I don’t think intermediaries like stripe have any direct responsibility in this respect but I could be wrong. The volumes are huge and few SARs actually are investigated or prosecuted.
Um, no. Banks file a lot of those. If it’s me using my dads credit card number then sure, not a SAR. But most of that activity is systematic: either backed by organized crime or a semi-professional fraudster. Those most definitely would get a SAR