The fans wouldn't have cared how their mooncakes tasted, as well as how it was made. The only thing that they had in mind was to help their idols get more money, so it was fine as long as their mooncakes didn't kill anyone.
The videographer who sneaked inside the factory asked if this was the right thing to do since the mooncakes were already extremely expensive. If they switched out the ingredients, their boss might fire them, and they would all lose their jobs.
However, the worker said that it wasn't him who took the money from using cheaper ingredients. He might be a relative of the boss, but he wouldn't dare to do such things on his own. It was the boss's idea to switch the ingredients in order to reduce the cost. He even mentioned that all the things that he just said were just repetitions of the words that he heard from his boss.