"'A definition isn't imposed - it defines.'
but it's who sets the definition that matters."

Kinda' like Stalin when he says something like it's not who votes but those who count the votes that counts.

A definition is arbitrary depending on the agenda of the creator. Webster's has been upgraded considerably. There is little unanimity.

Folk is not limited to gigs. It has a broader reach. Folk is a bird in flight. A song on a page is a photo of a bird in flight. It changes as people change but is not frozen in time.

It involves a community. A business is not a community. Show business is not a community but a commodity.

Folk music has to be accessible to anyone otherwise it is "art" or "elite" expressions of art.
It also must be accepted by many to find longevity.