A group of ad-tech companies, including PubMatic, details SWAN, an anonymous identifier that lets users control ads they see, as an alternative to web cookies
Context & Ripple Effects
SWAN arrives after years of browser-driven pressure on cookie-based tracking: trade groups including the IAB had already petitioned Apple to soften Safari's Intelligent Tracking Prevention in 2017, and Apple followed with its own Privacy Preserving Ad Click Attribution in 2019 rather than accepting industry proposals. With third-party cookies being dismantled across the web, PubMatic and fellow ad-tech companies are now proposing their own answer instead of waiting for platform defaults.
The pitch is a user-controlled anonymous identifier — consent replaces covert tracking. For PubMatic, freshly public after its IPO and expanding into formats like Roblox video billboards, owning a credible identity standard is also a hedge on its core programmatic business.
First-order effects
- PubMatic and the participating ad-tech companies gain a cookie replacement they control, letting publishers keep addressable inventory while giving users explicit say over the ads they see.
- Users shift from invisible third-party tracking to a visible opt-in model, changing what data advertisers can buy against.
Second-order effects
- Browser makers — most notably Apple, whose tracking restrictions forced this search for alternatives — decide whether SWAN survives inside their ecosystems or gets squeezed out by native tools like their own attribution tech.
- Rival ad-tech firms must either join the SWAN consortium or back competing identity schemes, splitting publisher adoption and fragmenting the post-cookie market.
Third-order effects
- If the pattern holds, digital advertising's identity layer consolidates around consented, industry-governed standards rather than any single platform's default — a contest between collective standards and walled-garden solutions.
- Publishers' revenue planning, already being reworked amid the broader dismantling of personal-data-based advertising, comes to depend on which identity approach wins rather than on cookies returning.
The trend: As browsers strip out third-party cookies, ad-tech is racing to replace passive tracking with user-consented identity standards it controls itself.