Why is big data unethical?

Could you elaborate on why some consider big data to be unethical? Is it due to the potential for misuse of personal information? Or is it because of the power imbalance that may arise when corporations have access to vast amounts of data on individuals? Additionally, how does this relate to the ethical implications of using big data in the finance and cryptocurrency sectors? Are there specific concerns related to data privacy and security that need to be addressed? Understanding these nuances is crucial in navigating the ethical landscape of big data.