I work in niches and I see a lot nonsense. If it's not Google Books or non-adult sites, then there is a ton of websites that use redirects, malware, pure spam and are ranked in top.
So the situation for niche / long tailed keywords is this:
xnxx/xvideos (a LOT) + other tubes in top 3-5, then a mixing of crap sites or risky even to click on them + google books etc.
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