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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[–] 4 points 2 years ago*

There's not really much evidence that targeted ads work any better than random ads. Plus they already have a point of data to serve ads: what video the user is watching.

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