In 2018 on Gaon only 5 idol group songs were able to surpass 1B digital points:
BLACKPINK- DDU-DU DDU-DU
MOMOLAND- Bboom-Bboom
TWICE- DANCE THE NIGHT AWAY
BTS- IDOL
In 2019: 1 (Boy with luv)
In 2020: 1 (Dynamite) At the current rate around 3 songs are expected to reach it.
2021 looks promising for girlgroups so far, latest boygroup songs are having a big start but later dropping.