Correct me if I'm wrong but it's my understanding that defederation is in fact bidirectional. lemmy.world can't see new posts from beehaw after the announcement.
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I think it's different with Lemmy since people make posts in communities and it's in the community moderator's power to remove problematic comments.
If an entire instance supports or encourages such behaviour though, then you're right and such instances should be defederated.
The creator of the list is not adding unofficial communities in the index, so there might be the communities you're looking for on Lemmy already.
If not, it's still very early days so give it time each day many more communities are being created.
Each instance will have different perspective on it. Some would obviously censor more stuff than us. It will depend on the user what kind of experience he is looking for.
If you're looking for anime songs, https://hikarinoakari.com/ and https://osanime.com/ are good places to search. If you couldn't find it in those two sites, there's always the fmhy wiki to go through.
Edit: Saw your comment on the song you're looking for, here's the link for it.
Just Uncheck this. (in your settings)
UPDATE: the fault was on our end, one of the admins added an instance in the allowed instances which meant we were only federating with that instance for a few hours.
Sorry for our mistake, and thanks for pointing it out quickly. It has been reversed and things should be back to normal now.
I can view those communities just fine, can you elaborate where the issue is ?
It's an issue that will be fixed in the next update (which is gonna be released pretty soon)