Web crawlers often superficially parse robots.txt files, which can lead to unintended consequences like overloading servers or missing valuable data. The robots.txt file functions as a contract between the crawler and the website, and ignoring directives like crawl-delay or misinterpreting user-agent scoping can result in rate limiting or incorrect assumptions about what is accessible. Data scientists and ML engineers should be aware that robots.txt frequently omits important data sources, and that the file’s contents can change unexpectedly during a crawl, necessitating continuous monitoring.
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