It's still early days, and kbin and Lemmy are experiencing a massive influx of Reddit users.

I would compare it to Mastodon just after Elon Musk took over Twitter. Giant influx, and for a few weeks it was full of people talking about Twitter. But then they got that out of their system and started talking about other stuff, and now Twitter only comes up if Musk does something really, really, really stupid.

I expect Lemmy and kbin will follow a similar trajectory. There will be a period when it's all Reddit sucking all the time, but people will soon enough start using them to share news and links.