How sure are you of that? I’m not sure those 2 BTC were ever on a coin and with no provably honest way to verify that the funding was done truly randomly, I’m sure anyone ever had a chance to win. Check the OP’s trust history. It explains in further detail.
AFAIK, all that happened was mistake and not deliberate. The 2 BTC should still be there in one of the lucky coins unless he f'ed up the privkeys.
I did redeem mine and they all were funded (0.01-0.05)
I am glad you posted that because I have been trying to read up on that and didn't think gravitate was a scammer really and it was more a mistake.