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There are already plenty of newsletters that consist of basically SEO spam. I don't think that's a problem, as long as I can identify and sign up for the good ones.

Wouldn’t people just unsubscribe?

I’m an SEO person, and true SEO is about providing value and helping the searcher. Not about gaming it. Google does a great job at removing the black hats, and a pretty good job at removing the grey hats, but it’s not perfect.

If google was really good at removing then Pinterest and Quora would have been downranked/removed from the index.

And then there is this spam site called AnalyticsVidhya whenever I search for stuff related to machine learning.

Gaming SEO still works, so I have to maintain my own blocklist of websites that automatically hides the biggest offenders from my results.

Undoubtedly true. Doesn’t change the fact that true SEO is about helping the searcher resolve their query. Google is evil, but they have the best search algorithm in town.