The way I see FLoC is that it's nothing more than a compromise.
This isn't a web standards feature like WebMIDI or WebHID that fulfills the (ever expanding) requests for features from web developers. It isn't a feature that the average user would ever ask for. It's simply a way for Google's ads business to continue functioning in spite of a web community that is gradually becoming privacy-conscious.
"Okay, it is true I can do nothing to force you to eat this pile of poo and I have nothing as means of payment, but let's make a compromise: How about you eat half?"
How about no, Google?
DRM made its way into browsers only barely, and in that case they at least had something people wanted.
This isn't a web standards feature like WebMIDI or WebHID that fulfills the (ever expanding) requests for features from web developers. It isn't a feature that the average user would ever ask for. It's simply a way for Google's ads business to continue functioning in spite of a web community that is gradually becoming privacy-conscious.