>>104832520From what we know based on what the members themselves have said, the biggest difference is in the brand direction, their contracts and contractual obligations. Contrary to the rest of the holomems they have no "1m wish" for example, a bigger focus on group music and also on earning money via sponsorships/marketing rather than streams, we also know that their cut is lower to the traditional holomem but get preferential treatment by management to get more of them instead.
That said, the brand was saved by Raden and her memes going viral, because there's no telling how it would be right now if she didn't hit big with one of the most precious demographics for marketing, elementary school kids. Banchou has been doing real good too but not at Raden's rhythm while Kanade and specially Ririka keep struggling to find a commercial niche. And yes Ao is not coming back, a lot can be said about that but missing their first live and their 2nd album promotions completely?, she's out for good.
And then there's flowgloss, which has failed to have their own "Raden" so far and suffer a bit from bad marketing, but with people like Niko and Chihaya I feel like they'll be fine even if they don't have any lighting in a bottle success.