I spend most of the time on Kbin, sometimes lurking and sometimes commenting on different posts.
I can't talk about sh.itjust.works because I rarely see content from that instance. Sometimes a meme, or sometimes a techie news post. But very rarely, as I said. If you stay federated or defederated with sh.itjust.works, I don't really care, because I don't really know that place or the content it's published there.
However, I strongly prefer to stay defederated from lemmy.world. I really can't understand why an instance with the .world domain is so US-centric. I don't give a shit about Iowa, Idaho, Florida, Montana, Texas, California or whatever posts from related communites I see while browsing all on Kbin. Besides, being myself anti-nazi, anti-fascist and anti-tankie, I support when other instances defederate from far-right and far-left instances, but I don't understand why they defederate instantly from certain instances and take some time to defederate from other certain instances. It's sad, but lemmy.world is the most similar thing to reddit right now, and it seems that they want to monopolize everything, because there are communities on other instances, as well as on Kbin, that have few activity, if any, in favour of .world ones.
And then there is a cryptic reply to a comment I made on another post.