“…Only very recently have studies begun to turn to describing their day-to-day governance, evaluating their success in practice, and seeking to explain what factors underlie successful implementation (for e.g., Alaassar, Mention, and Aas 2020). Evaluating the sandbox in practice reveals that its performative success arises from intense regulator-firm collaboration early in the governance process (Choi and Lee 2020;Butor-Keler and Polasik 2020;Alaassar, Mention, and Aas 2020;2021;van der Waal, Das, and van der Schoor 2020). Through this collaboration, regulators can exert influence over firms and the course of their innovation even in the absence of clear, definitive regulatory rules for a given innovation (Ranchordas 2021a, 10).…”