Why is reddthat seemingly blocked by an "instance filter".

This doesn't seem to be an app setting but something lemmy.word is filtering. What's the point of hiding but not blocking, and why this filter at all?

I heard Lemmy modding is "open", so is there some way to track and see why something like this is done?

Edit: see comments, it was actually an app setting but not something I changed/applied myself.