Fair enough. I never got the appeal of Instacart & the like but I guess it is good that the option is there should one need it.
If you use Instacart app to order items from Costco the price is actually different. I guess using Costco.com I have my membership benefit.
What is the meaning you are trying to convey here? Genuinely confused by this sentence.
I think "I can care less" is meant to mean "I can care less than most people do, because it doesn't matter to me".