Earlier quoted context omitted.
But don't the adtech vendors have to declare what they do with the data? (Purposes and Special Features)?
IAB europe had a shared list of vendors and their purposes amongst the ad industry, and everyone's popups using the TCF framework just prompted with the same list because they _might_ be in the ads, not because they'd actually be on the page. Many of the vendors claimed every purpose, often as legitimate interest, regardless of what they actually planned to do and if they _did_ count as legitimate interest.
These were often not even listed in the framework. There was little-to-no compliance/auditing that I am aware. It was business as usual for many ad networks.