AI 中文总结
本文首次纵向测量谷歌隐私沙盒API在Web上的部署，发现采用率停滞，多数API使用率低且持续下降，仅CHIPS例外，揭示隐私保护兴趣广告的挑战仍未解决。
AI 中文摘要
2025年10月17日，谷歌宣布退役大多数隐私沙盒API，结束了近五年对其替代Web上侵犯隐私的数据收集方案的实验。该计划旨在平衡隐私与广告功能及跨站追踪，但面临反复重新设计和有限的生态系统支持。在这项工作中，我们首次对隐私沙盒在Web上的部署进行了纵向、考虑用户同意的测量。通过使用自定义调用监听器和对前10,000个网站进行每周爬取，我们监控了所有主要API在退役前几个月内的使用情况。早在谷歌宣布之前，采用率就已停滞不前：大多数API仅被少数参与者使用，其活动在我们的研究期间稳步下降。即使是谷歌计划保留的API也没有显示出增长迹象。唯一的例外是独立分区状态Cookie（CHIPS）。总体而言，隐私沙盒的消亡留下了如何实现隐私保护的兴趣广告这一未解决的挑战。
英文摘要
On October 17th, 2025, Google announced the retirement of most Privacy Sandbox APIs, concluding nearly five years of experimentation with its alternative to privacy-invasive data collection on the Web. Designed to balance privacy with advertising functionality and cross-site tracking, the initiative faced repeated redesigns and limited ecosystem support. In this work, we present the first longitudinal, consent-aware measurement of the Privacy Sandbox's deployment across the Web. Using a custom call listener and weekly crawls of the top-10,000 websites, we monitor the usage of all major APIs in the months preceding their retirement. Adoption had already stagnated well before Google's announcement: most APIs were used by only a handful of actors, whose activity declined steadily throughout our study. Even the APIs that Google plans to maintain show no sign of growth. The sole exception is Cookies Having Independent Partitioned State (CHIPS). Overall, the demise of the Privacy Sandbox leaves unresolved the challenge of enabling privacy-preserving interest-based advertising.
