That's a key question. You don't necessarily need that many of them, though, if you're whitelisting at the domain level. A few dozen people could work giving a rating to many thousands of domains every year. An ideal number might be in the thousands.
I'd also say they probably shouldn't be in industry, because they'd have an incentive to game the index.
> Perhaps machine learning could help with scale - start with a human curated dataset, then train a model on it.
While this is true, I don't think search engines other than Google and Bing need to worry that much about being gamed. It's just not worth the effort.
That's a key question. You don't necessarily need that many of them, though, if you're whitelisting at the domain level. A few dozen people could work giving a rating to many thousands of domains every year. An ideal number might be in the thousands.
I'd also say they probably shouldn't be in industry, because they'd have an incentive to game the index.
> Perhaps machine learning could help with scale - start with a human curated dataset, then train a model on it.
While this is true, I don't think search engines other than Google and Bing need to worry that much about being gamed. It's just not worth the effort.