The Winklevi are running an exchange; and since most people know about bitcoin already, I think it's safe to assume that they shilled an altcoin to let people gain more interest and potentially them gaining more users on Gemini.
That seems most resonable explanation.
Doesnt make it right as a whole situation. I would assume Winkelvoss twins have higher standards and would do more in terms of promoting Bitcoin and their exchange.
Kinda dissapointed in them for this.