As you may know, there are various debates over 2/3  BIS central bankers' speeches  issues such as obtaining consent as well as conducting data analysis and using the results for socially acceptable purposes, in addition to complying with laws and regulations, including the Act on the Protection of Personal Information.
It has been pointed out that the greater the amount and scope of data coupling, the greater the network effects, thereby increasing benefits at an accelerated rate. While this in itself could yield large benefits to consumers, it could also cause new problems associated with monopolies or oligopolies, where one or a few entities have too strong a domination over data.