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.
I use Kagi too, it’s surprisingly snappy! Like seriously impressive for a small org. They talk about speed optimisation being critical for them as well. I find the result to be excellent as well. A true Google replacement/feels like Google in its prime.
I believe they have their own index and bot as well?