I like eating well+healthy and spending 20 minutes every couple days to buy fresh products seems like a small investment in both my body and wallet. There are things that having money is supposed to help us sweep under the rug - I'll never move anything bigger/heavier than a box from one house to another again. Nutrition shouldn't be one of those things. Nutrition and health should be one of those things that having all the spare money/time lets us get more, not less, involved in. The investment is moreso important if you have a family.
The fundamentals of nutrition, say how to pick a melon or how to understand nutritional labels, is as lacking as the fundamentals of personal finance. These delivery services can do well by specific groups (say the elderly), but in general, I worry that they'll make us further ignorant about nutrition.