A large chunk of idol fans are often far beyond well-adjusted entertainment consumers, so ”twisted” is relative. Thinking of themselves as family and trying to steer their oshi ”down the right path“ is a popular thing. Acting as a brand organizer or promoter is another common phenomenon. These kinds of obsessive parasocial relationships are quite profitable for companies, so it takes significant excess to prompt blowback.
That's indeed true from what I've understood. However, Kimiya isn't obsessive. He's always trying to keep Urumin at a certain, proper distance. Now when he believed she had made more fans, he decided to fade into the background. I reckon it was partly pity talking when he always was there to make sure Urumin had at least one face-to-face visitor during the fan meeting events. If she had managed to make more fans, perhaps Kimiya had only rarely participated anymore, though I'm sure he would have still sponsored her financially. That's why I said it's like he's acting like Urumin's father, who doesn't want to get in her way, but keeps making sure she's okay financially and doesn't get discouraged, without expecting anything in return. That being said, maybe I'm totally wrong and that's commonplace idol fan behavior as well.