You already opened the door to enter the McDonalds. I doubt that peoples hands got that much more dirty walking the 2 meters from the door to the touchscreen.

The doors at our local McDs are usually kept open.

You'd think McD's would've made an app by now, working with ibeacons and/or location systems to detect where you're placing the order at, and seamless integration with Apple Pay / Google Wallet. At least that way you wouldn't have to touch the screen.

I do hope (assume?) they clean those things several times a day, hygiene rules and such.

They do have an app, although it's based on GPS + selecting a location rather than iBeacons.

It's actually one of the more interesting challenges of beacon (and QR) adoption; most of the obvious/easy to implement use cases are already well supported by GPS

Literally everything in a city has been touched by random other people

On the plus-side at least people will be touching the screends before they've eaten the greasy food!