If it had been possible,china government would have done it much before to block bitcoin completely in its country.But it has tried to do it step by step by first banning ICOs,then implying very strict regulations against bitcoin exchanges and now trying to issue a new coin wechat.Same is the case with russia.But in china,people still trade bitcoins in countersales with people directly.
SO,bitcoin could not be completely blocked by governments.
the absence of evidence is not the evidence of absence. i've outlined how it could be accomplished in my previous post right before yours. i dont think china wants to ban cryptocurrencies outright, if anything, i think the chinese regime would want to find a means to control the cryptocurrency market above an outright ban. with bitcoin and cryptos in general on the rise, it only makes sense that any degree of control over the system puts a group at a pretty serious position of power, maybe even one that could give them enough influence to benefit greatly if cryptocurrencies take off even further. besides, if they wanted to ban bitcoin, it's a simple matter for the government to write legislation outright banning the use and possession of crpyocurrencies; they wouldn't have to be so roundabout by banning ico's and imposing regulations.