Napoleon was never defeated in an open battle until 1809. He had several close calls, but ended up victorious in every single battle until May 21, 1809, at a place called Aspern-Essling, near Vienna.
Archduke Karl, a brother of the Austrian Emperor, was trained for the military since he had no chance of becoming the next Emperor. Karl studied Napoleon's tactics, and to make a long story short, he defeated Napoleon.
Worse, Jean Lannes, a marshal of Napoleon, was killed in the battle. Till then no marshals of Napoleon had died in battle, and the loss of Lannes showed that Napoleon was no longer invincible.
It significantly hurt his prestige, and although he later won the battle of Wagram which led Austria to submission again, other countries began to have second thoughts.
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SNSD's decisive defeat occurred on December 9, 2011, or January 6, 2012, depending who you ask.
SNSD was invincible in 2010 and 2011, and was more dominant in Korea than BTS ever was in there, because in 2010 and 2011 SNSD did not have to deal with IU, while in the years 2019-2021 BTS did have to deal with IU who denied BTS its Korean dominance, which led to them being dragged to the military and her having the most youtube views in Korea in 2022.
IU defeated SNSD two times on the dates above , ending SNSD's dominance, and more importantly, she broke the Soshi bond, the mythical bond which united all SNSD members.
IU breaking the Soshi bond was the beginning of the end of SM domination of KPop as well, which is another story .
Min Heejin, who did not appear in this post until now, has succeeded creating the same effect in Hybe and BTS.
BTS members have not said too much about MHJ, but given Seokjin's behavior of choosing to have a solo concert precisely at the same time other members are discharged, shows that the bond between the members are destroyed, or at least very seriously shaken.
Taehyung and Jungkook were sympathetic with New Jeans, and Taehyung with MHJ since she helped to produce his solo album, and although neither have said anything after Danielle put a blue hat (meaning MHJ) to answer JK's instagram post, all of the members would be thinking that Bang Sihyuk treated MHJ like a queen and if she did not rebel she was going to make an amount of money significantly larger than everything the members had earned to now.
Given IU and now Blackpink Members are running their own affairs, BTS members' confidence on Bang would have weakened significantly and some members would be thinking that as soon as their renewed contracts expire they should go out and do their own things when they still have shelf life remaining.
MHJ might lose the court case and lose a lot of money.
However, the bomb she threw at Hybe won't go away easily, and she succeeded damaging Hybe, as all of its acts are not as great as they used to be, and if BTS breaks away, she probably played a greater role than anyone else.
So she definitely won in that aspect.