This chapter contributes to understanding the possible impacts of China’s Cyber Security Law once that law is fully implemented, as it concludes that Chinese authorities conduct an ongoing cost–benefit analysis in evaluating data localisation policies and practices, and that this partly explains China’s delay in implementing the data localisation provisions within the law. This is also consistent with the longstanding practice of the Chinese government to create fuzzy logic laws in areas of rapid change in order to allow for flexibility in implementation depending on the milieu. The costs and benefits of data localisation vary over time, requiring continual re-evaluation; hence, the laws can be implemented and reinterpreted in line with fuzzy logic. In particular, what is meant by ‘important data’ can be changed according to the policy considerations outlined in this chapter.