I’ve been having bubble tea my whole life (I’m half Vietnamese and it’s popular there too) and I while I don’t get the sudden obsession, I am grateful for it because it means I have more places to get it from.
Though, I should point out, most of those calories are from getting tea high in sugar and milk. You can get bubble tea with no sugar and milk, and limit yourself to just one topping. while it’s still about 150 - 250 calories, it’s still better then 350 - 450 calories.