I suppose one relatively easy scenario for me to imagine would be these massive databases of information on billions of individuals being either hacked, leaked,

I suppose one relatively easy scenario for me to imagine would be these massive databases of information on billions of individuals being either hacked, leaked, or taken by groups with idealogies which could use such data to discriminate or worse. A slower moving but potentially more insiduous effect on society might be the slow cracking down of any semblance of privacy and the use of all this data to discriminate whether intentional or not. And indeed there have already been studies showing that a lot of these AI programs trained over large data sets are discriminating against minorities and the poor. I doubt it's intentionally built into the system but it appears to be a side effect of some systems.