They don't have to. The possibility to opt out from tracking have been available for a while, although it was always pretty hidden in the settings.
After I opted out, I started seeing awful ads: mostly semi-naked bodies of people claiming to lose weight or bald heads.
Of course it's easy for Google to just say that this is what their economically optimized algorythm selects for a perfect stranger, because those are the only advertisers that risk spending ad money on someone they know nothing about.
Long story short: it's a sort of bribe already and you cannot prove it is happening.
Turning off the display of personalized ads and turning off data collection are different. Do the setting you are talking about prevent data collection?
After I opted out, I started seeing awful ads: mostly semi-naked bodies of people claiming to lose weight or bald heads.
Of course it's easy for Google to just say that this is what their economically optimized algorythm selects for a perfect stranger, because those are the only advertisers that risk spending ad money on someone they know nothing about.
Long story short: it's a sort of bribe already and you cannot prove it is happening.