Advertisers are shifting focus from reach to measurable outcomes. The open internet is gaining ground on walled gardens with improved data, AI, and credible measurement. Market consolidation is accelerating this change.
For digital publishers and ad-tech professionals, the longstanding divide between open internet ad inventory and walled gardens is beginning to close. While two-thirds of consumer attention remains on the open web, only about one-fifth of ad budgets have historically followed. This imbalance, shaped by a decade of closed-platform dominance, is now being challenged as open internet players invest in better data, artificial intelligence, and transparent measurement.
Open internet publishers collectively reach audiences at a scale that surpasses any single closed platform. However, fragmented technology stacks and limited outcome visibility have made it difficult for these publishers to connect advertisers with the right audiences. As a result, inventory that cannot clearly demonstrate its value often attracts lower demand and reduced CPMs. Published benchmarks indicate that advertisers typically pay twice as much for equivalent reach inside walled gardens compared to the open internet, a gap driven by both pricing and the data advantages of closed platforms.
In recent years, the focus for advertisers has shifted from cost-efficiency to business outcomes. The central question is no longer how cheaply media can be bought, but what measurable results an investment delivers-whether in customer acquisition, market share, brand perception, or sales. This shift places greater emphasis on performance and verifiable impact, areas where the open internet is now making a stronger case as its infrastructure and data capabilities improve.
Trust in walled gardens is also being tested. These platforms have long been seen as reliable due to their precise targeting and easier attribution, but as the open internet increases transparency-such as through enhanced supply-chain visibility-their relative advantage is narrowing. Notably, in June, AppsFlyer secured over $1 billion in investment from Google, Meta, Moloco, and Unity at a $2.7 billion valuation to develop independent, AI-powered ad measurement. AppsFlyer publicly stated that none of its investors would receive preferential access to its APIs or measurement signals, signaling a broader industry recognition that independent, verifiable measurement is now essential.
Advancements in AI, contextual intelligence, SDK-driven intent signals, and privacy-first identity solutions are further narrowing the data gap. Open internet platforms now have more effective tools to predict audience behavior and connect ad exposure to outcomes. As these capabilities mature, the distinction between open and closed ecosystems is shifting from data availability to the effectiveness of signal activation.
Integration across demand and supply is becoming a competitive edge. The traditional separation between buy-side and sell-side technology is giving way to platforms that can close the loop across demand, supply, data, and performance. This integration attracts stronger demand, generates richer data, and improves advertiser results, creating a flywheel effect that benefits platforms with end-to-end capabilities.
Market consolidation is accelerating as AI, measurement infrastructure, and data partnerships become standard requirements. The open internet remains fragmented, but the market is now favoring larger, more capable companies that can operate at scale and compete with walled gardens on outcomes. This trend is expected to preserve the diversity and plurality of publishers while enabling more credible competition for ad budgets.
As publishers and platforms seek to demonstrate the value of their inventory, the ability to connect advertisers, publishers, data, and verifiable outcomes will determine future success. The open internet, with its scale and growing AI-driven capabilities, is closing the outcomes gap quickly enough to offer advertisers a real alternative to closed platforms. For example, some publishers have already seen significant traffic gains by syndicating evergreen content, as seen when Lodestar Media doubled its pageviews through a syndication strategy with Stacker, freeing up editorial resources for local news coverage.
