And all that tracking comes down with inability to take risk on business side. Ad company wants to be 100% sure that ads are shown to humans, and pay only for those shown to humans(going deeper - to specific cohorts of humans, which in the past was approximated by content of the site showing ads).
Whereas sites serving ads want to extract as much money as it is possible from advertisers based on their audience count.
The incentives are on both sides to to one-up each other without tracking - hosts by inflating visitor numbers, advertisers by disputing that.
In a perfect world ad(wouldn't exist i know but bear with that) companies would pay X/month for site with Y visitors, where X depends on Y. No need for tracking, and roughly over multiple sites and multiple months it averages out.
Not enough conversion rates(risk for ad company - they could pay less)? offer lower rate per visitor next period.
Site gets spike in visitors(risk for host - they could charge more)? report higher estimated Y for next period.
What we got instead is an insane tracking infrastructure that costs way more than any possible profit gained for both sides. It's not even profit - it's avoiding being 'scammed', avoiding risk.
Remember that all that tracking bullshit started before targeted advertising was mainstream and widespread. It all started with bots and inflated click numbers, and inability to accept risk.
Tl;dr banning targeted advertising won't remove all tracking bullshit