I don't think that anybody has suggested that modern songs are, in themselves, less worthwhile than older ones which are (perhaps) considered "traditional". They are a different subject, that's all.

Perhaps some of them will become part of tomorrow's tradition; that will be a subject for tomorrow. Until it happens, any discussion of "tradition" is best focussed on what comprises "tradition" as we experience it now: that is to say (and as Anahata and I, to name but two, have already said) the procedures involved together with the relevant cultural artefacts (songs, melodies, dances, narratives and so on); and their observed contexts.

Anonymity, copyright status, and -to an extent- age, are pretty much irrelevant.