Can you prove your wordings or have you any link which says like this? Never spread rumor as many altcoins already proved their value and established and investors first choice. May be some altcoins do scam after their ICO but not all altcoins are scam.
Not all coins are a scam because there are still a lot of good coins to invest if it's where you can say which coins you think scam
and in my opinion, it just triggers another coin, what you can earn money with altcoin scam