And they've only added (most of) these recently. What they've done for me is is increased the time it takes to check out by at least a third. They're paying for the ads with lengthened lines, which is a little shocking when talking about the automated option, because customers choose the automated option to save time.
It might be a bad expectation for us to have. McDonalds might find it more profitable to start ripping out seats (especially with covid), and adding more automated checkout stations. Have us spend 5-10 minutes ordering. Offer discounts if we spend 10 additional minutes ordering and watching ads. Enter us into a sweepstakes while we order that pays every half-hour in free food.
You could cram a lot of 2-sided touchscreen stations in the footprint of a McDonalds; people standing everywhere like a pachinko parlor, or a storefront full of video poker machines.