As I explained, I am not completely marketed on this analysis, mainly because I do think the majority of people possibly use "free of" and "free from" interchangeably—besides in the case of "free of cost"—or arbitrarily like one particular or one other form to express a similar concept, with no https://drive.google.com/file/d/14hrpBHBebZB7SuXhV7sUnMwZIuxqpI1J/view?usp=sharing