I'm really happy to see so many people posting this article. While I was a little annoyed at first, I realized that it's better overall to see this popping up everywhere.
If you haven't read this yet, It's great for understanding the upcoming challenges the Fediverse will face.
From what I can tell, and don't quote me on this, this doesn't really matter.
Most of my subs I have on my own instance say subscribe pending but I still get the posts federated. Not sure what the reason is, would love if somebody could chime in.