Here's the thing. It was a Harmonix live stream. Anyone watching that would ALREADY be, if not a backer, someone who's prone to support them. How would Jeff calling into that influence anyone?
If anything, Drake coming on GB's stream and talking about it would be the problem. That would be the case of a games journalism site pushing a kickstarter. If you have a problem with something, that'd be the thing. (I don't care mind you, but there you have it)
People using “Good artists copy, great artists steal" as a get out of jail free card really annoys the crap out of me. They seem to be missing the point.
To copy is to just replicate what's been done. To steal is to make it yours. To create ownership of it. To "steal" a creative work isn't just tracing a picture, it's examining why another artist drew a picture a certain way, and taking the techniques you learn from that and applying it to your own, new works.
A "clone" isn't stolen, it's copied. And it sure as hell don't make you a "great" artist.