This chapter delves into the crucial role of trust in data sharing within smart city contexts, drawing on research from various sources, including (Cao et al. in A trust model for data sharing in smart cities. IEEE, pp 1–7, 2016; Khan in Sustain Cities Soc 40:1–15, 2018; Riedmann-Streitz et al. in Int J Hum-Comput Interact 1–32, 2024). I examine the insights provided on creating and fostering sustainable smart cities, focusing on key aspects such as ethics, trust, privacy, transparency, incentives, and success. To establish sustainable smart cities and communitiesCommunity, trust must be forged between government organizations and citizens. Without this trust, smart city initiatives will fail to achieve their intended outcomes. This approach emphasizes the use of both financial incentives and trust-building strategies to promote long-term adoption of sustainable practices among citizens. I hypothesize that by offering financial incentives, such as cash rebates, tax advantages, and free energy-saving light bulbs, and consistently delivering on these promises, governments can build trust with their citizens. This trust, in turn, will encourage citizens to adopt sustainable behaviors, which over time will become integral to their daily lives. By integrating financial incentives with trust-building measures, I aim to create a robust foundation for successful smart city development, ensuring that these initiatives are not only effective but also sustainable in the long term.