Google Chrome's Cookie Phase-Out: What You Need to Know

One of the most critical topics of 2024—how Google Chrome plans to rewrite digital advertising in the browser with Privacy Sandbox proposals and how companies adopt the technology, or don’t—is finally ramping up. On Jan. 4, Google is releasing a new browser feature called Tracking Protection, which, when activated, will cut off a site’s access to third-party cookies. Tracking Protection will be activated for 1% of a randomly selected group of Chrome users globally, marking the year’s first notable step toward third-party cookie deprecation. Cookie Crunch: Performance Marketers’ Preparation (or Lack of) for Deprecation Those who are part of the test will see the option to “Browse with more privacy” when they open Chrome on desktop or Android. The rollout beyond the 1% will happen gradually in the second half of the year. If a site in the test can’t function, Chrome will surface the option to disable Tracking Protection and revert to using third-party cookies. Naturally, there are a lot of unknowns, especially since full deprecation by the end of the year will depend on these tests and whether the U.K.’s Competition and Markets Authority agrees. Here’s what we know. A sense of urgency hampered by lack of resource While adoption has been very slow on the buy-side, there has been a step change in urgency. Paul Bannister is chief strategy officer at publisher management platform Raptive, which has been running the Protected Audience API (renamed from FLEDGE in April) in ad auctions since September, when Google made Privacy Sandbox application-programming interfaces publicly available. He said that since the beginning of December, more marketers have been keen to start testing over the next three months. But there is a gulf between the desire to test and the resources available to invest in new product development in order to execute a full shift to privacy-preserving technologies. “There are those who are still in denial and, unfortunately, I don't think 2024 is going to be an easy year for them,” said Ana Milicevic, co-founder at consultancy Sparrow Advisers. As with tech adoption before it, it’s a chicken-and-egg situation. Tech companies need demand before building the tech, and the business imperative to shift buying away from cookies has been lacking, but Chrome's deadline finally solidifies that, she added. 1% is still too minor for many “Beginning with just 1% of browsers being impacted, there’ll be little to no immediate impact on things like tracking, targeting or measurement in the short-term,” said Paul Bland, head of biddable at Havas Media Network U.K. “We need more insight around the effectiveness of the new solution and the breadth of adoption across the ad tech landscape before we draw conclusions.” Raptive has been scaling up the numbers of Protected Audience APIs running in auctions since September, but the findings are too narrow for now. While the targeting is working, the next conversation is getting data on effectiveness. One agency buyer, who isn’t currently testing, said they wouldn’t expect to see any impact until at least 30% of cookies were deprecated. Targeting is solid. Attribution is a concern Figuring out how to reinvent the digital ad ecosystem in the browser all at once encompasses a raft of features like targeting, ad frequency and measurement. For now, targeting is the most solid. Bannister estimates that Google is about 75% there in terms of what it needs to supply to the industry, including better documentation and improved features. “Measurement will break,” said Eric Wheeler, CEO at publisher ad-tech platform 33Across. “Programmatic measurement was founded on third-party cookies, so we can expect to see many data errors. Google Analytics will be able to track what occurs in its walled garden, which will cause big upstream challenges.” The agency buyer added that the industry might need to rethink historical benchmarks since many marketers use pixel solutions across platforms like Meta. Auction dynamics in disarray As Google increases the 1% of users who have access to Tracking Protection in the second half of 2024, there will be shifts in auction dynamics. “With a shrinking pool of third-party cookie inventory available, we can also expect to see rising CPMs (cost per thousand impressions) for third-party cookies as part of the cookie inflation,” said Wheeler. “The quicker companies can find solutions that can scale and are interoperable will improve how they fare.” Some do not understand the scope of the meteor heading toward them. Paul Bannister, chief strategy officer, Raptive The Trade Desk, stalwart champion and Google competitor in the open internet, has been publicly critical about how Privacy Sandbox will lead to lower ad prices and slower page loading, as well as further cementing Google’s dominance in the ad-tech industry while strangling out other publishers and marketers looking to make money out of the open web. A winnowing of ad-tech firms No one denies that there is an overabundance of ad-tech firms. If some of those companies go out of business when Chrome deprecates, that’s probably not a terrible outcome, said Bannister. But no one—not the CMA or Google—wants a whole swath of the market to collapse. For Raptive, that means getting parties like key supply-side platforms and demand-side platforms to at least track the users in the 1% test, as well as comparing the revenue impact of cookie deprecation. For publishers, that also means making sure they have updated to the latest version of the open source suite of products for publishers, Prebid, and are enabling adaptors from SSPs that support Protected Audiences. “Some do not understand the scope of the meteor heading toward them,” said Bannister.

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Google Chrome's Cookie Phase-Out: What You Need to Know

Sites will no longer have access to third-party cookies for 1% of Chrome users Jan. 4

Lucinda Southern

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