Swift and unexpected shifts of financial regulations can have profound implications for the general population. This is evidenced by China's abrupt transition in its stance on P2P lending in 2018. Initially embracing these platforms, the abrupt regulatory pivot to widespread shutdowns. Our empirical research, drawing upon credit application data, demonstrates how this indiscriminate approach hindered economic development opportunities for a significant portion of borrowers, particularly the underprivileged. As a remedy, we advocate for the implementation of AI-driven regulatory frameworks. Rather than a monolithic approach to all borrowers, AI helps distinguish between real financial risks and those that can be managed. This nuanced strategy safeguards individuals' economic progression, while efficiently mitigating financial hazards. For policymakers and industry stakeholders, our findings underscore the importance of contemplating the broader ramifications of regulatory decisions and harnessing innovative methodologies, such as AI, to strike an optimal balance. Financial regulators often focus on containing risks in financial services; however, they may not simultaneously pay adequate attention to regulation's adverse effects. This study examines how the economic development of borrowers was affected by China's suppressive regulation of peer-to-peer (P2P) lending in 2018, which unexpectedly switched from an "all-in" policy to an "all-shutdown" policy, leading to a massive closure of P2P lending companies and the eventual shutdown of the entire industry by 2021. Leveraging data on individuals' credit applications, we show that this one-size-fits-all regulation obstructed borrowers' economic development potential, especially for underprivileged and underserved borrowers, as reflected by their credit scores and their selection of financial channels. To alleviate the unintended adverse effects, we advocate using artificial intelligence (AI) to stipulate personalized regulation as a PolicyTech solution. We demonstrate that by restricting some borrowers' access to P2P lending according to their AI-predicted financial risk, it is possible to protect borrowers' overall economic development opportunity, while containing credit risks. This work yields significant theoretical and societal implications. History: Olivia Sheng, Senior Editor; Huaxia Rui, Associate Editor. Funding: Financial support from the National Natural Science Foundation of China [Grant 71831006], the Research Grant Council Hong Kong [Grants GRF 11501722 and 11500519], the InnoHK initiative, the Government of the Hong Kong Special Administrative Region, and the Laboratory for AI-Powered Financial Technologies is gratefully acknowledged. Supplemental Material: The online appendix is available at https://doi.org/10.1287/isre.2021.0580. [ABSTRACT FROM AUTHOR]