No, Ethereum is not a scam coin. Ethereum is one of the famous, usable, tough, promising coin in the world of crypto. Ethereum is so usable because it can use to buy other coins, and it is used as a gas. So Ethereum is not a scam coin. Ethereum will build the future!
It looks like you can't even imagine how sophisticated, cunning and long-term fraudulent schemes can be. When it comes to money, schemes can plan for more than a dozen years.
Personally, I do not think that Ethereum is one of these schemes, although all the information provided looks suspicious.