From what I understand, Kbin and Lemmy are two different projects.
They both use the same protocol (ActivityPub), so they can talk to each other.
The main difference is that Kbin also has what's called "Microblogging", which is what you know from Twitter for example.
Thanks for the explanation. What terrible news...
Seems we're still in the early stages for this major happening, so I'm sure there will be more information released very shortly.
I guess this goes to show why a federated networks are important, and why people shouldn't flock to the most popular instance. Right now many communities are down because of this, while the ones that were wise enough to set up their own instances are unaffected.