I remember heading to a Korean buffet chain not far from where I live (in my country), in which they mainly cater Korean & some Japanese food (it has multiple branches) but the catch is that they’re charging customers the equivalent of 10 USD per take out container for food wastage if they want to take left overs (they’ve dealt with food deliberately being left uneaten before).
People deliberately over filling plates and not eating it all is really a shitty person issue…its a buffet so take a good portion and come back for more.
They also are probably trying to curb people from eating their fill and getting a full fresh plate to take home for free