Throwing the group out is over the top though. The management knew this would happen and should have made different precautions. And from what I saw it was nothing more than with a lot of other groups present (PASSPO, Tsubasa Fly, Bellring Girls Heart, Up Up Girls, Moso Calibration, just to name a few).
Maybe they should have kicked out those other groups as well. I don't like uneven application of the rules. But, well, it seems to have worked in the group's favour. They are getting loads of publicity now.
Hard to say without knowing the details. For example, did BiSH or POP encourage this behaviour?
What I am sure of is, that the usual jumping/moshing has already been there the prior years and that it didn't seem by fans of the respective group performing. Groups like PASSPO also take a stand against this, on stage as well as on social media. Maybe that is why they are treated differently?
But with the forthcoming of more and more trash wotas in the recent year, who don't concern themselves with the occasion, the groups reputation and its regular fans, this sadly was to be expected. And management of TIF and the likes should adjust to the times by allowing it, but taking better precautions, instead of putting PassCode before Doll Elements, to name an example. Of course this leads to troubles.