They play bingo halls and have sub Mamamoo level touring, haven't on Spotify in several comebacks, haven't chatted on any major international platforms and their last comeback before Chill Kill has like 28m streams and 35m views...Fromis level numbers but they sold 1+m albums lol? Seems realistic. They were bigger in 2019 in every area and suddenly when the fake album boom happened their sales nearly tripped.
The album boom happened to practically every single group, from the top groups to the mid tier groups and even lower tier groups.
Album sales is and always has been a different metric from charting/streams and I blame SM for not promoting them (and I guess their other groups) better internationally and allowing them to play in larger locations. It's not a matter of fanbase but SM willingness - or capability - to invest.
In another thread someone mentioned Covid that started its influence worldwide around that same time, which seemed like a good explanation to me - people investing more in albums because they couldn't spend money at concerts or other outdoor activities. But sure, feel free to speculate.