You do you. For us it doesn't matter if it's a scam or not. Income and profit is income and profit. So what if the coins you mentioned will soon lose their value? What matters is now, it is a source of income and profit for most. Bitcoin and ETH, and all the altcoins which has always been labeled as scam in the forum all help to keep their value up.
   Most newbies kept saying altcoins are scam because they joined a bounty campaign but end up not being rewarded. I really think they should shut up because using your brain and your guts you can actually find good projects to support. Don't label anything as scam because you failed.