[ineedasername]

I think the point is that those activities are clearly "black hat", while astroturfing isn't inherently illegal. (well, maybe in some jurisdictions it is. I seem to recall that the UK has much stricter "truth in advertising" laws than the US)

It all exists on a spectrum though, and we can disagree on where the line for black hat is drawn, with no one being wrong because it's a matter of opinion.