To the folks that keep asking about whether doing this promo will affect those people's chances to get "new customer only" promos in the future....

I only speak from one person's experience, but I can tell you that I have signed up for numerous promotions over the years that were all for "new customers only". There does not appear to be much of a validation for that condition. But technically, you could be denied if you are not a new customer. It's in their T&C and it is their right. At least right now, they seem far more interested in signing up new accounts than enforcing their T&C agreements. As always and at any time, YMMV.