[DanBC]

I though that a big green thing just makes it easier for criminals to install a skimmer - they smash the original one off and add their fake version. Being big it has plenty o room for electronics.

I image searched "wells fargo atm" to find an example of the big green thing. I saw lots of older style machines, but the first link to the newer machine with a green thig was to an article about skimmers.

http://www.thedenverchannel.com/money/consumer/skimmer-camer...

[ZoFreX]

Not just can they remove (or overlay) the big green thing to add on their own skimmer... once the presence of the big green anti-skimming device is normalised, you can add big green skimmers to all the ATMs that don't have them yet: http://krebsonsecurity.com/2011/03/green-skimmers-skimming-g...