It becomes a bit more reasonable with 2 or more people. But yeah, even then the pricing is insane on these services. From my recent Caviar order (USD):

27.35 - actual face value of food (same as the in-store menu, at least for this restaurant) 2.32 - Tax 1.30 - "Healthy SF fee" 2.00 - Courier Bonus 4.92 - "Service Fee" (huh?) 1.99 - "Delivery Fee"

The restaurants, like the grocery stores in Instacart's case, determine the cost of food in their respective apps.

DoorDash seems to be the best value to me with their DoorPass option. I don't find the markup to be completely unreasonable, it makes sense to me and never felt shady, they have to make their money somehow.