I personally think these are mainly due to more hybe company stans giving chance to new groups debut under other Hybe sub-labels. Otherwise, hard to explain the coincidence that most are Hybe-related groups rising/going viral including TWS, ILLIT and now Bonedo. The continued success of LSRF + NJ following up to BTS, has really contributed to this, just like how the big 3 build their company stans. Even TXT and Enhypen are charting better than before.
Not that it is a bad thing. Hybe is equal to popularity nowadays, same like how YG was preceived as "quality" and JYP = hit GGs LOL
That's definitely a main factor but I feel like there's also more to it. There are afterall several non-hybe groups gaining attractions as well now. Riize of course, but also Kiss of Life, Qwer, Plave, Viviz.
The more noticable trend to me is that since 2022 idol music has been thriving in Korea, but that the traditional big 3 companies aren't the ones contributing the most to it. Gidle and Ive come from non-big 3 companies and they were succefull before any hybe gg had debuted that year. Everytime a group was succesful in 2022, it increased the momentum for kpop as a whole in Korea to the point that we now have at least 5 GGs that can dominate the charts there at the same time which is something unprecedented. The end of covid-19 probably also helped set the trend in motion.
With bgs now following the trendy sounds that these ggs conveyed, it's inevitable that they would start to reap the benefits from it as well. Many established bgs are also reaching military enlistement so they become less attractive for young korean fans to get into, so they will look for something else that feels more age appropriate to them. The fact that so many hybe groups now are doing well might thus simply be because they debuted a lot of them at the right time, whereas other companies are taking a bit longer to debut new groups.