Also received a text saying the exact same thing.  The  link sends you to a website where the claim to give gift cards out.  By following the 'terms and conditions' link on the bottom of the page, you can see that there are stipulations to receive the gift card.  In fact you need to participate in a program of purchasing 13 products (presumably off of a list) in order to receive said card.  It is a valid assumption that the places on the list are wholesome enterprises seeking business.  However, there is no validation of the company/individual sending the texts.  I did not bother pursuing any further, as I have no intention of being scammed.