I believe that the big win here is the 'Monitor'. Having it publicly that one of the worlds largest tax havens has agreed to have a monitoring like functionality employed is a huge hit to the entire tax evasion industry. It will(should) make large tax evaders worried that other banks are doing the same thing without public notification, as parts of other plea deals.

This monitoring thing, could be a significant deterrent and informant.

This kind of thing is especially problematic for the types of wealthy that have to worry about public opinion, politicians and employees of publicly traded or well known companies etc.