There is no standard, well-known way for a website to advertise, "hey, here's a cached data dump for bulk download, please use that instead of bulk scraping". If they were, I'd expect the major AI companies and other users[0] to use that method for gathering training data[1]. They have compelling reasons to: it's cheaper for them, and cultivates goodwill instead of burning it.

This also means that right now, it could be much easier to push through such standard than ever before: there are big players who would actually be receptive to it, so even few not-entirely-selfish actors agreeing on it might just do the trick.

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[0] - Plenty of them exist. Scrapping wasn't popularized by AI companies, it's standard practice of on-line business in competitive markets. It's the digital equivalent of sending your employees to competing stores undercover.

[1] - Not to be confused with having an LLM scrap specific page for some user because the user requested it. That IMO is a totally legitimate and unfairly penalized/villified use case, because LLM is acting for the user - i.e. it becomes a literal user agent, in the same sense that web browser is (this is the meaning behind the name of "User-Agent" header).

You do realize that these AI scrapers are most likely written by people who have no idea what they're doing right? Or they just don't care? If they were, pretty much none of the problems these things have caused would exist. Even if we did standardize such a thing, I doubt they would follow it. After all, they think they and everyone else has infinite resources so they can just hammer websites forever.