Interesting question which also leads to how we treat any learning of a song using modern technology. We've had similar questions before such as the validity of learning songs from YouTube. To the vast majority of people none of this is any sort of issue.

The only perspective I can give you is that all of my family songs I now sing I learnt after I became a folksong collector. I don't consider myself in any way to be a source singer, but that's just my opinion.