In reply to tyty.

FYI, artists have always put our multiple remixes following their singles (blinding lights, bad guy and their dozen remixes).

You are only noticing it now because,
1- their huge fanbase is actually buying and consuming it all (hence most of the remixes charting super high for you to take notice).
2- you are Just pressed that a Korean group is selling music at a rate others can't.

Either way, while their fanbase is keeping em at the top by purchasing all their remixes, other artists fans do so with merch. I guess army got the right idea to keep you guys pressed, and their faves at the top.