This article is essentially complaining that Ping is one sided in that Bands can post pretty much whatever and all users can do is buy music.

I don't see what's wrong with that, it's the defacto way Twitter works. Fact is that beyond a small group of influencers nobody gives a crap what anyone is saying on Twitter. On Ping those people that are the influencers are going to be the bands. There was an article on here a few days ago where a guy came to the conclusion that no one was paying attention to his Twittering and it was a waste of his efforts.