I am not exactly sure what you're referring to, but the website has been letting you choose between currencies for quite some time now.
Perhaps the website programming automatically selects the currency for you, according to which country's website your visiting or, if you're logged on, which country your coming from, or even which country you're flying out of, which you, of course, select when searching for flights.

Again, I'm not sure what the "scam" is supposed to be, but almost every company that accepts payments in a specific currency will charge a conversion fee if you wish to pay using a different currency (which would save you the conversion fees of your own bank).