noting that a $299/year Amazon fresh subscription is required to play, this thing probably amortizes itself and then some pretty quickly. (Increases frequency of orders, increases number of things ordered, likely to increase retention of users ie length of subscription.)
What subscription are you referring to? If you spend $300 a month you get the big radish program which gives you lower minimums for delivery, but other than that there's no subscription program afaik.
Edited: I guess in the bay area it's a subscription program. In Seattle there's no subscription so I was confused.
"Amazon Prime Fresh members get the benefits of both Amazon Prime and AmazonFresh for an annual membership fee of $299. Prime Fresh membership is currently available only in the Southern California and San Francisco, CA Metro areas."