Doesn't HN have some sort of "flame war" prevention feature where people are automatically prevented from commenting/replying in rapid succession? Rate-limiting

Doesn't HN have some sort of "flame war" prevention feature where people are automatically prevented from commenting/replying in rapid succession? Rate-limiting posts/sharing and comments on Facebook seems like a good place to start. Maybe it isn't necessary (and probably not possible) that we stop disinformation entirely so much as we slow it down.