Probably play the "We are too big to fail" to defense as usual.
Because Y'know, we're banks. We're special.*
This story smells all kinds of fishy. The ATM hardware is standard from various mfgs.
So is this a fault in the ATM code for transaction reporting at source, or a fail in the banks in house SW that crunches that data to produce a "suspect accounts list" ? Who writes ATM code? The banks provide the graphics but do they do detailed internal functions as well?
Wouldn't that be a pretty strange ATM reporting fault? Doesn't report some transactions, does report others? Keep in mind, those transactions are partly how the bank knows how much money is in a customers account. Sounds like the bank should be suing the ATM mfg. OTOH if it's in house they should sue their IT supplier.
*When I look at a bank I see a business. If it can't meet it's obligations due to fines then it's an ex business. It's customers need to find a new business to do their business through (after they've been compensated by the personal protection scheme most governments run) and shift their payments. It's loan book gets sold off and eventually everyone with a loan or mortgage through them gets a letter telling them the new arrangements.
What may complicate things is wheather they are still using that BS "insurance" process where by a claim on their "insurance" triggers multiple other bets (which is what they are) to fail.
It's way past time more banks were put out of their misery.
"Business without bankruptcy is like Heaven without Hell" as IIRC George Sorros put it.