An Empirical Study of Google's Advertising Ecosystem: From User Profiling to Ad Targeting - Zheng, Tianming; Li, Hua; Meng, Shu; Xu, Haitao; Li, Zhao; Hu, Shichang (2025 IEEE 12th International Conference on Cyber Security and Cloud Computing (CSCloud), Cyber Security and Cloud Computing (CSCloud), 2025 IEEE 12th International Conference on, CSCLOUD, 2025)