Based on what I've seen on basically any social media platform or boxing news site, the majority of fans don't fukk with the TKO Boxing idea.
The three main reasons are Dana White being a dikkhead who nobody likes, a monopoly inavoidably leads to fighter exploitation and a monopoly or at least a sustained one being highly unlikely in boxing even with all the money so this new promotion - that would probably be even more rigid about not working with others than PBC in its heyday - would just muddy the waters further and nobody needs that.
Turki really has shat the bed here, all he had to do was to continue what he did in the last 1-2 years with additionally buying up the big alphabet organizations, leaving only like two of them so too big of an influence in one's hand is avoided but it's still not a hot mess where there are 4 of them and then just let fighters from different promotions compete. There was 0 need bringing in a new entity, especially delivered by these guys.