But the OP is specifically talking about information specifically besides that "supplied here". Like, measuring how much it really costs, the hidden challenges, etc, in setting up a large automated mailing system.
They're doing it to put the gmail logo on your fireplace mantle. Which is just fine, because you might not otherwise have sent a cheerful card. Plus their snowflake pun is hilarious.
I'd buy the argument if I was allowed to send, say, ten of them instead of just one. One would think that, if the value of piquing the interest in GMail of my first choice recipient exceeded $0.25, then the value of sending a card to my third or forth choice would also have a positive ROI.