Right but Kbin doesn’t defederate with many if anyone right now. You can also block entire instances as an individual user so defederation is less important in Kbin.

Are you talking about Lemmy for that testing? On Kbin I regularly see communities with no Kbin users subbed, just a large amount of upvotes. The algorithm for “hot” content on the all feed works much better on Kbin right now. Subbing to an any community is easy on Kbin. You just open it via a link and tap the menu to bring up controls for the magazine/community.