Robb Knight details his experience with Perplexity AI ignoring his robots.txt rules and disguising its user agent. Knight started blocking 'PerplexityBot' via robots.txt on March 30th and server-side via nginx on June 14th. Despite these measures, Perplexity AI provided summaries of content that should have been restricted. Knight discovered Perplexity was scraping content using headless browsers without identifying as 'PerplexityBot', bypassing robots.txt. His further investigation showed Perplexity using a generic Chrome user agent string, indicating dishonest practices in content access.