B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
29.1%
29.1% -- publisher ad revenue decline for web publishers (2025)
Third-party cookie removal decreased publisher ad revenue by 29.1% in recent field tests.
- Observed in recent field tests
Attribution:
View source
Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
29.1%
Unit
Percentage
Data Vintage
2025
Entity
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
50
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Mellowtel
Primary
Tier C
https://mellowtel.com/blog/website-monetization-guide-2025 ↗
Source Article
How to Monetize a Website in 2026
Want to know exactly how to monetize a website in 2026? Stop relying on outdated "just add AdSense" advice. To turn traffic into actual revenue today, I always tell my clients to map their monetization strategy directly to their current visitor volume, audience search intent, and session value.
Whet…
Original Research
Mellowtel
· Original study ↗
Methodology
Field tests referenced by Mellowtel blog; original study not named
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
web publishers: 29.1% publisher ad revenue decline. Source: Mellowtel (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/cookie-removal-publisher-ad-revenue-drop
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<blockquote cite="https://lighthousedata.io/data/cookie-removal-publisher-ad-revenue-drop" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>29.1%</strong> -- publisher ad revenue decline for web publishers<br><small>Source: Mellowtel (2025) · <a href="https://lighthousedata.io/data/cookie-removal-publisher-ad-revenue-drop" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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