What is the most active/popular fediverse project?

Just wondering as im curious and im still learning.

I liked piefed until I learnt about the hidden filters. But still, I see their point. There are dozens of lefties here! Dozens!!

Edit: thanks rimu for your reply. I was unaware of that post. Piefed is my fav again :) Somehow I was under the impression that piracy comms were banned.