I hear what you're saying, and instinctually I feel gross about it. But, if enabling advertising allows the website I'm visiting to stay in business, I think that might be a trade-off worth making.
People already pay for things like Kagi to try to get out from under the mountains of SEO adspam. I have to pay in time and aggravation to stay sane in the face of ever escalating tactics to shove ads in my face and manipulate my online behavior. So I don't think a smaller web would be a bad thing.
But I don't see that as likely to happen anyway; companies have found out that advertising and data harvesting is far more profitable, and governments have found the same to be very useful for exercising control.
Why should I give up my data to any private entity?
If their business model depends on ads, then I say it should die.