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Allowing a site to only be scraped/crawled by professionals (i.e. Google) ensures that those engaging such activity do so in a respectable manner.

It would be ideal to define the terms for scraping (similar to how API calls work) as opposed to the acceptable authors of scrapers.

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I am not sure you can define those terms in a formal way. You can crawl the data in some way but use it for many different purposes that are difficult to control.

Fancy extension to robots.txt?

They are professionals now, but at the beginning it was not at all.

I would imagine even in the beginning that they, as developers, practiced good procedures while scouring the internet.

Given the difference in the size of the internet now and then, the backlash faced for poor practices may not be comparable.. so perhaps not.

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