When the Electroneum was conducting a bounty campaign, many at some point thought they were scammers and left the campaign - lucky ones who stayed in it and got a good payment!
When i was starting here in cryptocurrency a lot of people in my country is promoting electroneum and i am confident that it is not a scam, electroneum have raised a lot of money on there ico and even i dont invent on it, i know it is not a scam.
Definitely, Electroneum is not a scam. ETN is a privacy coin, a mobile-based platform and it is designed for smartphone users, more than 2 billion I guess. It can also be mined via smartphones, however, I don't know if it's productive.
The one thing its not is a privacy coin...