Comment by _factor

Make a sign up opt-in database where you put your demographic information and a unique disposable identifier per potential customer.

Allow browser plugins that collect allowed data and send it to this database for advertisers to use for targeting. Let local code determine what I send, not an external entity.

Give the web an advertising standard that only shows approved data when you choose to link your unique ID with your current ID. Make this link severable.

Hell, you’d have people signing up for the advertising and targeting if we knew it wasn’t going to be abused and effectively the only digital advertising legally permitted. The problem with the current system is consent.