https://www.techdirt.com/articles/20191211/18313143560/robyn-openshaw-green-smoothie-girl-threatening-slapp-suits-over-mediocre-reviews.shtml

Various health fads come and go. One particular one that I guess has been around for a bit is the idea of drinking "green smoothies." This was made popular by Robyn Openshaw, who is called "The Green Smoothie Girl" and has written a bunch of books, all around her views on approaches to losing weight and health, including the aforementioned green smoothies, and various "detox" plans. There's also something about "vibrations," but that's about as deep into the weeds as I was going to get on her views on staying healthy.

I have no opinion on whether or not any of that stuff works or is good for you (do your own research!) but it does appear that the Green Smoothie Girl, Robyn Openshaw, is not at all happy about negative reviews. People who merely posted on Facebook saying that Openshaw's claims were "unproven" among other things, started receiving threatening messages demanding that these mildly negative reviews be taken down or they would face lawsuits: