It's because we're loud, incredibly active, argumentative, and most importantly we are generally speaking unified. Yes there are differences, but compare the pushback when a hexbear posts something pro-china vs when someone else posts something anti-china. We'll get maybe 2-3 responses, all of which will immediately get dogpiled anyway. They'll get 10 of us. We also all upvote the takes we all agree on, so much so that it looks like vote manipulation. No other group on the fediverse has that type of unity, even if they broadly agree with each other.
Also the giant emojis probably don't help lol.