It's something that has not yet fully permeated Northern Europe, and Helsinki (where I live) has (or had..) one or two places to get it from (pre-pandemic).
I can only assume they are being used as fronts to launder money or as a business investment to secure residency as there seems to be no possible way even a city of Melbourne's size could consume this much bubble tea. It's almost at the point where there are bubble tea sellers directly next to each other in the street. And I'm talking dozens, if not hundreds, of them.
There are tens of thousands of mainland Chinese living in the CBD, and it’s basically a daily staple for a huge chunk of them.
Some of these places are charging $7-$8 for something that costs all of 20 cents to make. The margins are huge - the biggest difficulty is securing the right location with the right footfall.
That’s an example of Hotelling’s law [1]. Competing businesses are better off clustering together in high traffic areas rather than spreading out to cover the market in a way that serves customers more efficiently. It’s a weird phenomenon and a clear refutation of the invisible hand.
Actually it's the opposite: more choice is brought by the invisible hand where people naturally go to, even if it puts businesses in direct competition and thus reduce prices
I first tried 珍珠奶茶 at the top of Taipei 101 in 2009, and have always sought it out since. It was a thing in Daegu when I lived there in 2012. In Austria, I was surprised to see McDonalds having bubble tea in mid-2012! It was the popping-bubbles though, not tapioca. I discovered new flavours (e.g. Yakult) in Shenzhen in 2013, and drank it daily in Taiwan from 2014-2018. (not always milk, I'd mix it up with passion fruit, pineapple, grapefruit, whatever else). My favourite way to explore was to ask for "yi yang" - the same as the person before. My favourite was actually NuPasta, then Coco, then Xian Cha Dao, then 50 lan. There was one place where it only cost 30 NTD, but one time I got it without sugar and realised it tasted awful, so after that I realised I should pay 50-70 NTD for slightly better quality.
Unfortunately the Gong Cha and Chatime in Auckland don't accept my loyalty cards from Taiwan :-P