Wholeheartedly agree, but it also seems like kind of an inevitable failure, because users/browsers often had DNT set by default, and who would decide to click t

Wholeheartedly agree, but it also seems like kind of an inevitable failure, because users/browsers often had DNT set by default, and who would decide to click the "more tracking" option when they have a choice to set that option persistently and with feature parity. All boils down to economic issues that are not solvable with technology.