Beer dispensing systems that pour without a bartender — bottoms-up dispensers filling through the base of the glass, automatic self-pour units and countertop beer vending.
It fills the glass from the base through a magnetic valve in the cup, then the valve reseals. Pours land fast with far less foam and waste, which is why stadiums and festivals use them.
On the self-pour and vending units, yes — they meter by volume and bill by the millilitre or ounce, so staff stay on service instead of on the tap.
No. This is the pouring end of the system; the keg still has to be kept cold by a kegerator or a beer cooler.