rock is disproportionally sales-driven as well but rock fans also aren't buying the same tracks repeatedly. they are album buyers and concert goers, and they don't usually buy multiple copies unless there's a special set or whatever.
frankly i would say the type of digital buying BB is targeting is primarily Kpop fan behavior right now.
i really can see the problem from all sides. it's ridiculous to send the message that buying music is wrong but something also is wrong when a fan feels compelled to take on this burden repeatedly. every company involved is ugly and the problem.
Rock is also dead which makes this a moot point I guess Kek. Anyway this is similar to the Circle Digital Chart dilemma I guess I also don’t know what the right answer is here. On one hand it’s a fact that BTS made that much money from sales and DLs so why shouldn’t their success be included on the chart. But at the same time should fandom obsession be rewarded. Who really knows. I too see the problem on all sides.