ETH being a scam is more likely BNB trying to scam us. If you look at it If ETH is a scam (just a speculation) The market will tumbling down because ETH is one of the largest coin out there. If it turns out being a scam how do you think people would think about cryptocurrencies generally. They will have doubts which can result on the downfall of crypto. But no, ETH is not a scam if it is then it should be long gone when it reached it's ATH back in 2018.
True! It's just too fun to see people ask about thing like this! ETH has been around the market for a long period of time. It has gained its reputation and credibility since 2017. Personally I think ETH is the second most trusted coin in the cryptocurrency market nowadays!