Everyone understands this is business. You don't have to keep repeating that as if no one is getting it. The fact of the case is simple and most people in Korean media and and general public who are interested in this topic seem to agree;
IB Sports had a contract with Yuna that anyone in the industry would die for; not only the after-fact sense in which their return on investment for that three year period was at least 200%, but the real number should be much more than that, but because she was already making her name by the time they signed the contract. Again, IB having made an extremely good investment wouldn't have been an issue if they delivered what was expected from an agent. I am not saying this about them as the agent of Yuna, but of any athlete. Their representative work is sloppy at best. Take this from me or news media, I don't care. The news articles about this is easily obtainable if you can read Korean, so if you are interested, do your own research.
As a consumer who buy other people's service, you expect a certain level of quality in the service you pay for, especially when the charge is high. IB is considered by many that they have been way overpaid for the quality of their service. That is one thing; all they are saying is IB has been overcharging Yuna; and then, as Yuna leaves them, IB began all this media circus, spreading rumors about Orser, talking to the media about their deals with Yuna almost everyday and propagating their own takes about her leave, and relating Yuna to their foreseeable lawsuit against a former employee when she has nothing to do with it. IB is doing a damage control in the worst fashion imaginable, at the expense of their former client whom they overcharged. Their course of action for the last one week has left a bad aftertaste in everyone's mouth.
If you still don't get why people are trashing IB hard, try to remember last time you had a bad haircut from a hair stylist. And imagine the stylist goes around the town after your last visit saying he/she didn't do anything wrong and says things about you and your taste in hairdo. If this analogy doesn't convince you, I don't know what will.