china didn't banned bitcoin 100% . So it is not illegal like in Ecuador or Bolivia. If you live in China you still can use bitcoin ,you still can trade/exchange it, you still can buy it or sell it, you still can mine it. Crypto currency exchangers and ICOs are banned . If you are chinese you can move to another online exchanger websites .
Imagine chicken farms are banned in a country but it is still legal to eat chicken in restaurants ; so what to do ? Import chicken
Same for this bitcoin problem, you can move to a foreign exchanger. I think already some chinese traders or rich in bitcoin people has already moved their assets to foreign exchangers and they are back in business , that would explain the recovering of the bitcoin price.
This exchangers' ban might be a temporary halt activity (might take 6 months or 1 year or 2 years who knows) until some laws will be created to tax and track bitcoin more easily in China. Bitcoin increased to fast in price and governments doesn't have experts to make laws for it. Japan adopted bitcoin but is still learning this technology. If you walk on streets on a japan city right now, you're lucky if you find a shop accepting bitcoin.
Something similar happened to Coinbase when the american authorities requested personal data of the U.S. citizen users which are trading bitcoin, to pay taxes. But Coinbase didnt got forced shut down .
Keep in mind : It is better for a country to tax bitcoin than banning it completely.
Other cryptocurrencies markets are to small, insignificant , therefore criminal activities or tax evasion is to small,and it not worth it to waste time and resources to start a hunt targeted for altcoins. But remember bitcoin is not banned in china only exchanger websites, owning bitcoin in china is still legal.
https://www.nytimes.com/2017/09/14/business/china-bitcoin-exchange.html