As I said, I am not fully marketed on this analysis, due to the fact I do think most people either use "free of" and "free from" interchangeably—besides in the case of "free of charge"—or arbitrarily like a person or one other variety to express a similar concept, with no https://drive.google.com/file/d/14hrpBHBebZB7SuXhV7sUnMwZIuxqpI1J/view?usp=sharing