"(I thought I had heard everything)"
Obviously not - if you have a definition for something and decide that definition is invalid but don't bother replacing it - you de-define it - can't think of another word for it - can you?

Not conviced that what you are describing is folk or traditional
otherwise all those Aldermastons, Faslanes and Anti Vietnam War demonstrations I went on were 'folk' - nevrer heard them
described that.
What goes into0 making up folk is really far more complex than 'a fist in the face of the establishment' or the music industry.
That strikes me as part of the industry going Awol from where I'm standing.
More power to that.
Jim Carroll