If you are really looking to find a scam, the elephant in the room is Dash.
Yes, it is. "DASH = SCAM" is an altcoineer tradition. And the tradition continues.

Funny, though: the instamine happened - idk, two years ago? And how much X11Coin/Darkcoin/DASH has been redistributed through the exchanges since then ?

I'm not sure why NEM didn't make the poll. They almost scammed Tristan (Mr. Poloniex) out of his NEM by imposing an artificial deadline that made his NEMstake unconvertible to NEM. Read here:
https://forum.nem.io/t/nemstake-redemption-deadline/1118They made a little exception for him, but other NEMstake holders are still left in the cold with no NEM, even though all 9 billion NEM coins were created in the Genesis block, and are out there on the blockchain under someone's control, ready to be dumped on unsuspecting NEM hodlers.
Full disclosure: I still have irredeemable NEMstake because of this artificial and unnecessary 'policy' of refusing to honor the convertibility of NEMstake to NEM, so that old NEMstake holders are stripped of assets they paid for in good faith. Now THAT is a scam.
I love NEM but do agree that is a harsh deadline indeed. They should have really held these in a pot for those that can prove their claims.
This is true for a few coins though if you don't keep an eye out coins swaps happen and you're out. With the coins swaps I can see their point though because people can keep mining on the old chain and swapping for new coins where mining competition is fierce. With NEM this is not the case. NEM stakes are now like 8BTC so gutting if you missed it I would freak out.