Hmmm - well, how confident are you that (a) you marketed the app/website/product to the right people at the right times, and (b) that the landing page was worki

Hmmm - well, how confident are you that (a) you marketed the app/website/product to the right people at the right times, and (b) that the landing page was working correctly, and then (c) that the design of the landing page wasn't causing abnormal bounce rates? If all of that holds true, I think I'd opt for the "It just didn't work out" email. That may lead to other opportunities whereas just dropping it won't.