I think altcoin is safe or not.
Cryptocurrency is digital currency, so it is like as fiat currency in many side.
Like many fiat currency, there are many altcoin.
At first, if safe or not, is related on main development team or altcoin manager.
If co-founder leave own currency after ICO or get invest, it is scam coin and altcoin will be died.
But if real Team, they will keep promise, Until many user use coin and coin have a great price.
So If you want invest for coin ICO, after you check team member and idea and so on, you must invest.
At first, ICO price is very small, but, after marketing and listing, you will get more profit.
Invest for Good ICO.
Thanks