The ethereum is the king of ICOs, but it is also subject to very high volatility, because project teams can immediately sell the etherium immediately after the completion of ICO, thereby reducing the ethereum price.
That's one advantage of being a platform for ICO just like when EOS dumping so many eth at the same time it's really affecting the market although not for a long time but it's indeed affecting the market.
there's one time backthen when many ico are dumping their ETH at the same time and making the market bleeding, maybe ico must sell their eth gradually not at the same time altogether.