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Sorry, I don't understand the overriding sentiment here..

Are we now asking Google et al to be the gatekeepers of what is deemed correct and useful because they have a preferred alternative that fits with our view on the world?

W3Schools may not have the best historic reputation, but it still has a place in relevant search results.

I have personally used MDN extensively over the years, and love it for what it is.

Google already overrides ranking to put its own preferred things first in your results. The time to complain about Google being a "gatekeeper of what is deemed correct and useful" was years ago; now it's far too late.

Duckduckgo is the way to go. Priorities MDN and Stack Overflow, really good search engine.

I barely webdev, but when I do, I've found w3schools pretty helpful. What's wrong with it?

Most people that have used both w3s and Mozilla Dev Network prefer MDN, and formerly were disappointed that w3s's better SEO formerly meant wading through their links when googling.

Historically, w3schools had a lot of outdated (or outright wrong content):

http://www.w3fools.com/