I still don't understand federation and defederation. I know a lot of Japanese-language instances are defederated (or unfederated?) from here because when I look up hashtags in Japanese, only like 1 or 2 instances appear. But one post from misskey dot design appeared on my home feed, and I was able to boost it. The person's account shows zero following/followers, which seems unlikely given how many posts they have.
If I try to follow this account, is that a problem? If the instance was blocked, would this account be completely invisible to me instead? Are blocking and defederating the same?
If somebody could just point me to a good resource? I looked at fedi.tips but it didn't explain what I was looking for.