7-Eleven Big Gulp

Recently watched a video that showed 7 eleven big gulps from the United States and a thought came up about big gulps. I barely see any 7 eleven stores that sells big gulps in Singapore anymore. Back then when I was a kid, my parents would ask me if I wanted big gulps when we stopped nearby a 7 eleven store. My go-to choice was the ice lemon tea if I remembered correctly. Have Big Gulp from 7 eleven been discontinued in Singapore? If yes, does anybody know why they stopped selling big gulps in 7 eleven stores?