>>39405896People post this so often and somehow miss the most important bit where Korone says AN IDOL right at the start of the paragraph.
It all comes down to expectations, essentially. Often what kicks off bad feelings and resentment is that girl cultivates a certain kind of tight-knit audience of mostly single men, and then she unceremoniously drops them (or worse mocks them) once she gets big enough to not need them.
The Enna spergout yesterday is a very convenient example - you have people going off about how her fanbase is totally not parasocial, conveniently memory-holing that she used to thank superchats with kisses back when NijiEN was all-female.