This is explained on this support answer

It's a thing on Revanced YT even if spoofing an old version. Applies to the web version as well now

This seems to be due to some new EU law ?

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[–] 7 points 3 years ago (3 children)

Yes and no. Without a users video history (& other tracking turned off) best they can do is push random ads hoping it would hit one in a million. That is not effective and sometimes even diseffective (hitting a controversially opposite target). Tha harms YouTube on both ends more than the ad’s company

By pushing users to turn it on they apparently gain more than just pushing random horse crap.

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