How does CTV advertising work with walled gardens?

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Last updated: April 8, 2026

Quick Answer: CTV advertising within walled gardens operates through closed ecosystems where platforms like Amazon, Roku, and Google control both content distribution and ad inventory. For example, Amazon's Fire TV reaches over 50 million monthly active users as of 2023, with ads integrated directly into its streaming interface. These platforms use first-party data to target ads, often limiting third-party access to ensure privacy compliance and maintain user engagement within their ecosystems.

Key Facts

Amazon Fire TV had over 50 million monthly active users in 2023
Roku's platform revenue from advertising grew by 19% year-over-year in Q3 2023
Google's Android TV/Google TV reached over 110 million monthly active devices in 2022
Walled gardens control approximately 65% of CTV ad spending as of 2023
CTV ad spending in the U.S. is projected to reach $25.9 billion by 2024

Overview

Connected TV (CTV) advertising within walled gardens refers to digital video ads delivered through internet-connected television platforms that operate as closed ecosystems, controlling both content distribution and advertising inventory. This model emerged prominently in the late 2010s as streaming services and smart TV platforms gained traction, with companies like Amazon (Fire TV), Roku, Google (Android TV/Google TV), and Apple (tvOS) developing proprietary environments. Historically, traditional TV advertising relied on linear broadcasts with limited targeting, but CTV introduced programmatic capabilities. The rise of walled gardens accelerated around 2020, driven by increased streaming adoption during the COVID-19 pandemic and privacy regulations like GDPR and CCPA, which made first-party data more valuable. These platforms now dominate CTV ad spending, leveraging their integrated hardware, software, and content to create seamless user experiences while restricting external data sharing.

How It Works

CTV advertising in walled gardens functions through a controlled process where the platform manages ad insertion, targeting, and measurement. First, advertisers purchase inventory directly from the platform or through authorized partners, often using self-service dashboards like Amazon's DSP or Roku's OneView. Ads are served based on first-party data collected from user interactions within the ecosystem, such as viewing history, device usage, and subscription details. For instance, Roku uses its ACR (Automatic Content Recognition) technology to track what users watch and serve relevant ads. The platforms typically employ server-side ad insertion (SSAI) to integrate ads seamlessly into streaming content, reducing buffering and improving viewer experience. Measurement is handled internally, with metrics like completion rates and attribution reported through platform-specific tools, though cross-platform tracking is limited due to data silos.

Why It Matters

This approach matters because it shapes the $20+ billion CTV advertising market, influencing how brands reach cord-cutters and streaming audiences. Walled gardens offer precise targeting and high engagement rates—for example, CTV ads have average completion rates over 95%, compared to lower rates on social media. However, they also create fragmentation, making it challenging for advertisers to unify campaigns across platforms and measure overall ROI. Real-world impacts include increased competition among tech giants, with Amazon leveraging its e-commerce data for shoppable CTV ads, while Roku monetizes its hardware footprint. For consumers, this can mean more personalized ads but less data portability, affecting privacy and choice. The model's significance lies in its dominance; as CTV viewership grows, walled gardens are central to the future of video advertising.