Full Answer

The Privacy Sandbox story is relevant to every WooCommerce store owner because it shaped — and then un-shaped — how the industry prepared for tracking changes over the past six years.

Google announced Privacy Sandbox in 2019 with a clear thesis: third-party cookies enable cross-site tracking that harms user privacy, and Chrome would phase them out by 2022, replacing them with new browser-level APIs. The timeline slipped repeatedly — to 2023, then 2024, then 2025. Each delay reflected the fundamental difficulty of replacing a technology the entire advertising ecosystem depended on without giving Google disproportionate control over the replacement.

In April 2025, Google announced it would not remove third-party cookies from Chrome after all, instead offering a user-choice model. In October 2025, Google retired most of the APIs it had spent six years building — Topics, Protected Audience, Attribution Reporting, IP Protection, and Related Website Sets were all shut down or shelved.

The practical reality in 2026 is a split browser landscape. Chrome still allows third-party cookies by default. Safari's Intelligent Tracking Protection blocks them entirely and enforces a seven-day expiry on JavaScript-set first-party cookies. Firefox's Total Cookie Protection partitions all cookies. Brave blocks everything. Approximately 17–20% of global web traffic is already cookieless by default, independent of anything Chrome does.

For WooCommerce stores, the strategic lesson is clear: building tracking infrastructure that depends on third-party cookies works only for Chrome visitors who have not changed their default settings. Server-side, first-party data collection works across every browser, every privacy setting, and every future policy change.