Please don't discount how deep the rabbit hole goes with adtech.
I spent over a decade in adtech. I have several patents from > 8 years ago for metadata-based ad targeting.
While I agree with you that it is better to see relevant ads over irrelevant ads, the datastores that enable fine-grained behavioral targeting is, simply put, just too much power for any corporation (or government) to wield.
Corporations directly profit from larger data stores. The more invasive the data extraction, and the more available it is to their true customers, which are advertisers, the more they profit. The advertiser dashboards and ability to explore potential audiences based on targeting, both on G and FB, are astoundingly detailed.
I try to convince everyone in my life to run an adblocker and stay off FB.
One of the richest sources of metadata about you and your loved ones are your photos. I quit my day job to build a self-hosted, life-scale photo store, partly as a passion project, partly driven by disgust and penance from prior adtech work.