A while ago I started checking each highly ranked but low quality site in Google search for Google ads.
I'm never disappointed.
You can guess the answer for w3schools...
To be fair, a site like w3schools will worry much more about SEO than MDN, but I'm willing to bet that "shows our ads" has a positive impact on site ranking.
Low quality results that display their ads are the ideal scenario for Google:
1 user searches Google, sees some adds
2 user visits low quality site, sees more Google ads
3 user doesn't find useful information, goes back to search
Oh but of course! If the site shows Google ads then it must be a high-quality, trustworthy site, so you see they'd be irresponsible to not use it! (/s)
I'm never disappointed.
You can guess the answer for w3schools...
To be fair, a site like w3schools will worry much more about SEO than MDN, but I'm willing to bet that "shows our ads" has a positive impact on site ranking.
Low quality results that display their ads are the ideal scenario for Google:
1 user searches Google, sees some adds
2 user visits low quality site, sees more Google ads
3 user doesn't find useful information, goes back to search
4 repeat