Recent literature on platform governance indicates that platform privacy control， as a significant governance strategy， exerts an important effect on complementors. By integrating the competitive positioning framework from strategic management literature， it extended to investigate the relationship between digital platforms’ data privacy controls and complementors’ innovation and business model adjustments. Taking Apple’s introduction of the App Tracking Transparency （ATT） policy as an exogenous shock to platform privacy practices， it employed comprehensive application data from both Apple’s App Store and Google’s Play Store for the six months before and after the implementation of ATT， and adopted a difference-in-differences analytical approach. The results indicates that the implementation of ATT reduces complementors’ innovation activity and prompts their adjustments to business model. Furthermore， the impact of digital platforms’ privacy controls is found to be less pronounced among complementors with highly popular products， both in terms of reduction of innovation activity and the adjustment extent of business model. By re-examining the distinctive context in which privacy control is dictated by platform owners， it explored the underlying mechanisms shaping complementors’ responses， thereby extending and deepening research into how the design and implementation of platform governance policies affect complementors’ activities.