Just to throw my 2 cents worth into the mix. eBTC, otherwise known as eBitcoin was originally a free airdrop, but it doesn't end with this as I guess you could possibly regard it as a scam of sorts but I would say an honest scam, or more specifically a 'cockup scam'.
The original airdrop went well, but then after the coins were airdropped it turned out that there was a major cock up when it was discovered that a senior member of the dev team had in fact made a coding error of unknown origin, and resigned his post as a result of this. The coding error turned out to be a token killer. The eBTC team that were left holding the bag did well to rescue the entire shambles and rescued the token. As a result of this the plan was that a new contract was created and the old useless tokens (known as eBTC cold) were to be swapped for new eBTC tokens for all who were in possession of them on the understanding that the holders left the old tokens in a wallet, not on an exchange.
Needless to say that a large portion of holders were so quick after the airdrop to dump their tokens that a large amount were left on exchanges and in doing so were not swapped, therefore rendering them useless forever.
My own story is that I received the original airdrop (over 2000 tokens) and wasn't notified that I had them, so had no idea what was going on, and as a result I found out in mid December 2017 that these had been in my wallet all along, and had automatically swapped over to the new eBTC tokens which at the time of writing this post (January 2017) are on the exchanges and doing rather well at around 50 cents per token.
Current holding of eBTC worth just over $1000. If that is a scam, then I will quite happily accept any other scams that I can get
