I’d be amiss to say I’ve never seen any good content from those, but I do agree that the vast majority of content from those instances is trash, although I can’t speak of lemmygrad since all three instances I’m on block that one.
I’d also like to block .world, just because so much of it feels like a carbon copy of reddit, including the enlightened centrists and debatelords. I’ve seen some really good users and communities from there, but not really worth the hassle.
Hopefully one day we’ll have the ability to block entire instances at the user level. That would be really nice.