InstantWatch - What happens if movie is returned to Walmart

I have seen a lot of sellers posting digital movies that are InstantWatch links instead of actual digital codes. I was wondering what happens if these sellers return the movies they bought to get the InsrantWatch links. Would all of the buyers then lose their movies. Based on what I have read online InstantWatch is only available at Walmart and they will remove the movie from your digital library if the movie is returned to the store. Walmart also has a 90 day return policy so that makes this even worse for those of us who have purchased one of these “InstantWatch” movies that are now all over the Gameflip site