Of course, some things are too good to be true, they apparently lost hundreds of millions of dollars on the effort before closing it down earlier this year. At least they did in my area in January, my understanding is they ended it everywhere they didn't have a physical store presence.
• Delivery is by a background checked salaried Walmart employee in a company van rather than third party contractors.
• Tipping is not allowed.
• Instead of just delivering to your doorstop you can have them deliver to your garage, or even inside your home where they will even unpack them and put the perishable items in your fridge and leave the rest neatly arranged on your counter top or table.
Since the minimum order for free delivery with Walmart+ is $35, a 10% tip on a single order would be more than the $3.33 that a $40 year annual subscription divide by 12 is (and most people would tip $5 on a minimum order rather than 10%).