It ignores all NSFW communities. I'm planning on adding a switch for that, but if you really want, you can change nsfwFilter property in local storage through devtools. all is for everything, none is for no NSFW and only is for only NSFW communities.
Sometimes it fails to follow a community. Maybe it's because community is not yet "synced" to the instance you logged in from. Don't know much about exact reason, because I'm new to lemmy from the tech side.
There is also a planned feature to exclude whole instances. Currently only possible with editing local storage.
Pretty good. It's kind of like Stumbleupon for Lemmy communities. The only "issue" I saw is it includes the forbidden no-no instances that are defederated by a lot of the bigger instances for being... troublesome.
I honestly don't know how it should be. I'll leave that up to you. I wasn't logged in when I was going through communities. So that might be a way to filter them out easily - if you can pull a list of blocked instances from users' home instances once they log in.
I just pushed an update. If you log in, it will fetch defederated instances from your instance as well as communities you already follow and hide them.
That was quick! Logged in and went through a few skips. Not seeing anything worth noting, which is a good thing. I appreciate that it also pulls from smaller instances I've never even heard of.