Ethereum is no way a scam. People would have found out long ago if it was. Eth is currently one of the top5 or even top3 cryptocurrencies today. Even though both are cryptocurrencies, it just doesn't work the same as bitcoin.
Correct ethereum is not a scam, it is not a perfect coin but there is not such a thing so ethereum is one of those investments that is going to give you a lot of profits in the future.