It's true. They keep music streaming playlists going 24 hours a day, seven days a week. And they all appraise one another on how often to play the videos, to space it out in a rotation of other videos, to get around the viewbotting guards on youtube to make sure they inflate their essentially fake views on their essentially fake bands. The albums they put out are put out in multiple languages and multiple versions, each with multiple trading cards and assorted packaged-in crap which compels their obsessive fans to buy even more copies in case they don't get the cards they want and they just trade or sell away the card-less CD to spread the cult, or trade duplicate cards with one another. Then you start getting into the product placements. Stuffed animals, jank cologne, all sorts of worthless trinkets. All to extract even more money out of their sucker fans.
It's bad to the point where the actual band members have to be guarded with the products that they ACTUALLY use in their "personal" lives, because these obsessives will go buy anything they mention to the point it creates a product shortage that then effects the band member. It happened when one of those BTS twinks said what brand of laundry detergent they use. Like, two months worth of product got bought in the span of a day. The take a sick pride in it too, when any rational observer can see what damage being this obsessed will do to a person.
Friends don't let friends stan k-pop.