...and, there's not not a neat, simple cut-off point. Musical categories are on a continuum.

There's real, genuine, old traditional songs that no one would doubt, and then there's stuff with obvious 'folk roots' that has been processed and 'modernized'....either by messing with the tune, the words, the pace... or just the type of instruments used for accompaniment. This leaves us with stuff at both ends of the scale....and a gray area in the middle. I can usually tolerate the gray area being passed off as folk/trad...but some people want the gray area expanded as far as THEY define it- possibly because 'folk' is such a nice, easy, handy word.