I mean we know that Butter broke every record set by Dynamite and basically has highest first day and first week records on Youtube, Spotify and Amazon Music ever, which would be impossible without fandom growth, but just look at these concert numbers
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Almost 400k increase from MoTS One which was held in Oct, so 9 months on and they are adding fans at a very rapid rate. Their major growth seems to have come from Japan followed by India and marginally Europe.
So what will be new growth areas for BTS? I think more potential is there for them in Europe and LatAm for sure.