Melting the hole closed would make the beer taste like melted plastic I think.

it would make the beer taste like melted plastic if that thing uses ultrasonic frequency welding. but i highly doubt it would use that cause thats an expensive way to weld plastic.

it looks like it just uses adhesive or something on their cups on that bottom part. I still think several pinholes friction welded closed wouldn't make a taste.

Its actually magnetic rings. One ring molded into the cup, the other is a rubber magnet that is the stopper. When you push it onto the dispenser the rubber magnet lifts up and sticks to the dispenser, then when its full the magnet hits the bottom of the cup and makes a water tight seal. The magnet even has advertising or a team logo on it, and can be used as a fridge magnet when your done. These guys are gonna make a killing with this patent. The machine has a counter on it too, so no more free beers at the bar, lol.

Im thirsty now....