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I don't know anything about web tbh - what is that "key=AIzaSy[...]" bit? Is that a user id for duckduckgo private watching type of thing?


No, nothing personally identifiable about the so-called key. Every person who visits www.youtube.com uses the same one; it's public. Anyone can see it in the HTML page source for www.youtube.com. No need to be "logged in" or whatever the latest scheme is to track people for advertising purposes.




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