Pizza Hut in China stop serving help-youself salad

The most famous food of Pizza Hut in China is not its pizza but the help-youself salad.
If you ordered the salad, the waiter would give you a bowl, and you could fill it with what ever you want, but you had only one chance.
So people always wanted to fill as much as possible, and this became kind of a game.
There was even some articles on the Internet to teach you how to fill more.
Now, Pizza Hut said they are out of charge because of the salad, and they stop serving it.