This decade-long longitudinal qualitative study follows 31 smartphone users in China across four interview waves (2014-2023) to examine how mobile privacy understanding evolves alongside shifting computing infrastructures. Findings reveal three stages shaped by distinct interactional mechanisms: early functional acceptance of permission-based data access, growing vigilance triggered by behavioral tracking feedback loops, and eventual resignation as AI-driven inference made ecosystem-level profiling feel inescapable. Rather than a stable attitude, digital resignation emerges through cumulative infrastructure exposure, as each new system layer retroactively reinterpreted earlier permissions and exhausted users' capacity for self-management. The study challenges permission-centric design assumptions and proposes inference visibility, context isolation, and automated privacy agency as system-level responses.

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