As has everything else in the regimen. Clay is a naturally-occurring substance, people been using it in their hair since the beginning of time. So, clearly, Pinke Cube didn't claim to have invented clay masks or ACV rinses. All she did was study the regimens of successful naturals and realize, "Wow, a lot of these women actually wash/ clarify their hair regularly. Maybe that might work....?'
What's funny is, if you started a thread saying, 'I'm a natural who cowashes everyday, but my hair never feels moisturized,' the first thing people would tell you to do is clarify. They'd probably recommend a shampoo. Pinke Cube points out a way to safely incorporate natural clarifying methods into daily use and everybody's against it.