When I close my browser, all my cookies and site visit information is deleted. So, when I open up my browser and go to youtube, it is like I am visiting youtube for the first time. They don't know anything about me from my browser. I also never log in to watch videos so they can't track my interests. In the past, that meant some ridiculous video suggestions, but now it means I get no suggestions until I search for something.
I see something like this when I go to youtube now:
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