As industry deals with units sales now ( album, sps = stream and download equivalent. Record sales of adding cheap digitals with albums is dead format in streaming era and no more fake inflation )
BTS will be fastest to join 100 million sps club by start of 2023
Before their ten years anniversary
Only artists to debut this century to cross this threshold are so far Taylor Rihanna and coldplay. It took them 14 to 20 years
And others who are on verge of joining this are drake, adele
BTS added over 15 million in last 9 months till may end taking total to 73 million and looks like will end year with 83 to 85 milllion sps
By end of next year it will happen. And they will achieve faster than any of the artists to debut this century. Just legendary