Now that the third-party tracking ecosystem is slowly drying out I'm curious what advertisers will come up with to circumvent these new measures.
Probably fingerprinting – not to mention the fact that ad-people are lobbying both legislators (including the EU) and standards bodies (like W3C)... and in the latter case they're also directly contributing to the standards.
Well, there's the entire field of databroking (likely completely illegal under GDPR, not to mention unethical from the start) and real time bidding related to this.
Given the sorry state of privacy-compliance in general (whether that's ignorance of the law or consciously taking a risk) I seriously doubt that the field of adtech is much better.