The .cards namespace is managed by Donuts, and as usual with them, no particular purpose of the gTLD is specified - it is wild card. On the one hand, the .cards extension can hold a catalog of birthday cards - for free or sale. On the other hand, the .cards domain is perfect for a gift cards online department of any company - to offer discounts on products and service. On the third hand, if you would, the .cards namespace can host poker or gambling sites.
Are you looking for another extension? Check out our complete range of new domain names.