@starkerz can chime in I suppose. It's one of those projects which I guess if it doesn't keep growing then it's going to get farmed eventually. Getting discounts daily for going and buying food at the store outside is a nice way to get merchants to accept hbd and users to spend their hbd, but if it doesn't bring in more it's mostly going to be the same people low effort posting and claiming the value from inflation for doing the same thing over and over.
I think they lowered the discount recently and have been growing, so I guess as long as the experiment is working it's a nice way to bring in new people to the chain but hopefully it won't become stagnant as they may have to rethink their model by then.
Most of the Spend hbd post are one picture and 2 lines, these people are on hive to pay there groceries they dont care much about hive (which is understandable when it's hard to just pay for your groceries) but i dont think that the project is bringing much to hive, it bring customers that use hbd to pay but won't buy/hold hive -> might even sell the one they get