the kpop industry's whole allure lies in the illusion idols sell fans. whether its the fan-idol relationship illusion or the group member-group member relationship illusion. kpop relies on parasocial relationships and its how they are able to gain so many loyal fans that buy any and everything, that bulk buy, that spend crazy amounts of money on luxury birthday gifts for the idol ect. groups where the members don't pretend they are at least really friendly are the ones in danger of bad rumors. bc akgaes have no problem putting other members on blast in the name of their fav.
anyway, idols are aware of what is expected of them in this industry and they play it up. thats why fanservice is even a thing. sure some companies force it, but a lot of the idols do it because they can and know what they will gain from it.
the fandom will probably never change and so the industry wont either