they are doing great in the west, biggest GG, sold out concerts, merch, sales. They are doing better than BlackPink except maybe in recognition.
Their recent performance of the song Set Me Free really disagrees. Couldn't enter almost any relevant country's charts at all.
BP Charts longer in literally every single Western country for both their albums and songs on the main charts. Total consumption for albums and songs BP does better in 99 percent of Western countries as well. Born Pink sold like 350k units in the end, The Album 800k units due to longevity and maintaining overall higher ranks while on the chart than the average Twice album. For Reference, Between 1&2 is currently at 250k units.
Twice's recent album is having an amazing first week of sales though.
Twice are very far from the biggest girl group in the west.