Swiss banks are supposedly the safest place to store money, If the Swiss are willing to share customer data with the US, what else can't they share?
Just another tentacle of the Nothing is beyond our reach motto.
There might be a difference in that the banks that are rolling over have a presence in the US that can be leaned on.
On top of that I'm not sure how the US thinks it has the ability to levy and collect penalties against Swiss banks located in Switzerland that don't have a presence in the US to start with.
If the databanks have no business in the US that can be leaned on, perhaps they will be outside the US' legal pressure. Of course they will remain high profile targets for the NSA and any other criminal organization.