I'm reminded of something: Delivery. I remember first seeing grocery delivery proposed back in the original Death Wish movie. Lady shopped, then told the grocery store where to deliver the groceries to.
These days, most of the grocery store chains have delivery, Amazon delivers at least some groceries, etc...
For $13/month, Walmart will deliver to your house. Let's say it's a 10 mile round trip, at $0.25/mile*, a single trip is $2.50. Just to keep things reasonable but round.
So, 5-6 deliveries and that fee(which also provides other services, let's value the paramount membership at $0 because you don't like star trek and whatever) is paid for.
We tried Walmart+ for a few months. It would be OK *if* the people picking items weren't idiots. Stuff like getting marscapone substituted for fresh mozzarella. Never mind melted frozen stuff, etc. Maybe if you only live off of packaged/processed food, it would work, but not if you actually cook, and need very specific ingredients.
Almost every delivery required a trip to the store to pick up/return the item(s) that they messed up/couldn't find, etc. We ended up canceling, because it took less of our time to just go get everything correctly in one trip.