The branding for kbin is perfect for capturing the reddit migrators. The biggest friction point for the Fediverse is choosing an instance. If I want to join Lemmy, googling Lemmy takes me to a landing page with no join button, telling me to go to these other sites. Some of these sites even actively discourage signups, creating so many places for a new user to churn.
Also, see the cases where the admins of a few Lemmy instances act badly: now the brand of every other instance is tarnished.
If I want to join kbin, I go to kbin, and I signup. How easy is that? I personally think this is why kbin has been getting a lot of traffic compared to Lemmy instances, and this benefit is lost when other kbin instances begin popping up.
In my opinion, it makes way more sense to market the instances individually rather than as a whole. Federation can be discovered at the users own pace, instead of being the main draw which will always be the content hosted. This does add a bit of a prisoner's dilemma, but I do think it would end up benefitting the ecosystem as a whole.
I don't care if a site has stuff that caters to a crowd with viewpoints that I don't share, as long as they aren't hassling me.