Marianne posts a prompt every day, but I don't attempt it every day anymore.
With freewriting, since I want it to be unplanned, I don't edit after the five minutes. Maybe a little proofreading clean-up, but the content does not change at all. But if I can't get off the ground with a story, and what I have written sucks, I toss it out and start again. Or not. There are an awful lot of freewrites that offer no good reason to have read them. I hope I never publish anything like that.