Well, this explains this morning's activities in the altcoins. But sell? Buy the Freaking Dip, all you crypto newbies! Just because China's action might keep new ICOs from coming out, does not mean the other altcoins will be affected.
It's still a good time to get into cryptos, especially Bitcoin (BTC), Ethereum (ETH), and Litecoin (LTC). While 99% of the rest of the population is still unaware of them!