I'm too a participant of the impressio signature campaign but with their social accounts and website gone. There are no any hope left for the bounty participants.
I too read their whitepaper and knew it was going to be a ponzi and looking at the number of participants I got greedy assuming to would be successful like bitconnect or deeponion but they ran even before starting their ponzi.
You got the impression that it is a ponzi scheme and just moved forward, wow. If I see any kind of red flags like that I turn 180 and walk away. There are enough legit and honest campaigns worth to be supported.
It comes down to morality as well. Are you the type of person who wants to promote a scam? I'm not, I don't care if I can earn money. It's not right. That guy has the wrong mindset