Citigroup is facing significant challenges in addressing its regulatory issues due to a lack of adequately trained staff in critical areas such as risk, compliance, and data roles. According to the bank's internal assessment, this skills gap is a major factor contributing to the prolonged timeline for resolving regulatory concerns, despite the investment of billions in an overhaul. The bank's difficulties reflect a broader trend in the financial sector, where compliance hiring and associated costs are on the rise across various institutions, from fintech companies to smaller banks.