About changing the words. It was going on long before Dyla or Pete and the Carter Family.

There's some very good reading in this years, "Folk Music Journal" by the EFDSS.

Namely Before the Folk Song Society by,E. David Gregory - about Lucy Broadwood

"Devon by Dog Cart and Bicycle" by, Martin Greabe. About Sabine Baring-Gould.

Both of witch changed thins. even re-harmonising the melody's. Let alone the text.
It's well known the C. Sharp cleaned up things for his School books
etc.
They even rejected some drinking songs from their publications for their own reasons

Members get thhe "Folk Music Journal" for free.
It's available to others too. Check out C. Sharp House

The EDS is on line there too with some good clips

Chas