As usual, most people who have control of how technology is used on a broad scale are in positions of power suitable for exploitation. That is, the people I'm talking about are business owners and high-level executives (and the government) using technology to exploit workers. To be fair, that's not always the dynamic-- "normal" people can exploit each other too, and businesses and the government can as well. But it is the most pressing issue imo, because of the power imbalance. See also rent comtrol algorithms, automated insurance claim denials, etc.