It looks like that Sina took an unbearable burden on its back. Was it a commitment Sina was willing to make, that all uncensored messages were 'accurate'?
As a matter of fact, the new law granted police power to 'make disappear' anyone they do not like without court order thus justice procedures. The authority may feel it suited their life for now, but the measure would prove an unbearable burden in the long run. Soon, families of every disappeared person would automatically believe their loved ones were taken away by the government. Think of that.