Calling any project a ‘scam’ should only be done with clear evidence. Otherwise the only thing that’s a ‘scam’ is your incorrect opinion passed off as fact.
If you think a project is overly ambitious and won’t succeed, sure by all means say that. I even agree that the vast majority of projects will fail.
But after looking into Ethos in much more detail than you seem to have, there is certainly no evidence to indicate it’s a ‘scam’. In fact, it’s one of the most solid projects out there - as evidenced by regular feedback from the team, demos of their product and it’s features, Github dev activity, social media articles, strong telegram community, and clearly laid out whitepaper, roadmap, and modest initial funding targets during their ico.
As always, solid research trumps random opinions.