In that way they are fairly anarchistic. No leaders except those whose ideas rise to the top.
I think this gets forgotten in the rush to equivocate Antifa and the fascists: the left and the right work differently. Not only do conservative brains actually work differently than liberal ones, most particularly in how they attribute causation, but they organize differently too.
It's easy to miss this when we look at their online conversations, where the loudest and most extreme voices will always dominate the echo chambers, but liberals don't actually tend to follow people with nearly the same fervor that they follow abstract ideas. This is partly why cancel culture has become such a thing, and also partly why liberals have a reputation for backstabbing and infighting. The upside, then, is that while the crazy radical liberals get a lot of likes, there's always a handy long-winded philosophical justification for doing nothing in any particular case.
The right, on the other hand, coalesces around people; even before the GOP supported Trump and tax cuts but nothing else, they've been running on Reagan hagiography for thirty years and counting. They're not in any ideological sense the party of Lincoln, but it still suits them to be the party of someone. Gavin McInnes is the leader of the Proud Boys in a way that nobody could ever be the leader of Antifa.
In short, when the boss says jump, conservatives jump. Half the liberals explain how they took a principled stance against jumping, find a new boss, and denounce the half who did jump, or at least expressed a general willingness to jump, as having lost the way.
It's a feature rather than a bug here too; without actual Nazis to fight, Antifa would splinter into a thousand little Antiflets bitterly angry at each other over miniscule doctrinal differences but fundamentally unwilling to do more than gripe, modulo the fraction that really are just in it for the violence. Without Antifa, the Nazis would just hurt people of color and LGBT people more quickly.