I guess I’m surprised that it’s not possible to quickly deindex these spam farms and render their SEO spend a waste. Especially Google, I’m surprised they can’t detect and ban SEO rings more effectively.
"Permanently remove this site from search results" seems like the absolute easiest "personalization" to implement.
The reason Google doesn't fight SEO spam (and just generally annoying/obnoxious behavior such as paywalls) more aggressively is because it doesn't want to bite the hand that feeds - all these spammy sites have ads or analytics that benefit Google.
If you recently started crawling you won't be able to detect which content was 'first', and if you don't crawl as frequently as google you are reliant on your crawl frequency being quicker than the 'content stealing' speed.
No problem there. If a page hasn't been crawled, it won't be a search result.
If a full crawl of the web takes 3 months and A steals content from B after 2 weeks, it may not be possible to easily infer that A has stolen from B rather than visa-versa.
If I crawl every week and see that A posted it on the first crawl, and B suddenly also had that content on the second crawl, I can infer that B stole from A.
On the downside I could see this being used by terrible people to delist actual information sources so that they would only ever be served conspiracy theory sites in their searches as well.