For the moment kbin doesn't offer the possibility of blocking an instance. The only possibility if offers is to "silence" it, that means, the user don't see the posts from this instance, but the instance (Meta in this case) can access the data posted by the user.
Kbin is a quite young project, and it is still in development, then for sure the implementation of a real block/defederation feature will take a lot of time.
I was wondering whether some of the new kbin instances have decide to defederate from Meta. I was not able to find the information.
In other case I will need to delete all my posts, find new moderators for the two magazines I started, and delete my account without to have another alternative.
This is a good question. I did see someone over on Mastodon wondering about blocking IP ranges, but the consensus seemed to be that whack-a-mole security puts a high burden on admins.
Unfortunately I'm not technical enough to speak to anything specific to kbin
@smallpatatas ok... there are other options, but the problem is that the project is yet too young, and the devs are working hard in the functionality. I don't think that they will have power to address that in the near time.
Then I suppose I will need just to remove my posts, find other moderators for my magazins and delete account.