WFR is more self directed roleplaying writing, or at least as I was conceiving it. Basically the author/player is handing it back to the GM when they decide they want outside/GM input in the story. It’s a way of writing where the player has all the control they want within the parameters of the world and setting, but can always reach out for things unforeseen or unknown or alternative to help reset or whatever is required at the moment.
So it could be back and forth every paragraph (though I see logistical issues arising with that, since we can’t even arrange a couple of hours for a live game), or it could be pages and pages of writing and then throwing it back to the GM for a small section, before continuing on. Or it could be one day a back and forth, the next day pages and pages.
I think WFR stands for Writing, Free-Roleplay.