Is a perplexity visit not cached and shared between users who perform a similar search? I don't know much about perplexity, but I'd be surprised if scraped results weren't used to serve multiple searches and users. By bypassing the no-crawl directive, that is a violation of the website's expressed request. I think it is different if individual users chooses to bypass certain things on a website, but for a company to choose to do it is another story.