What's worse, knowing you have no privacy, or having the illusion that you have privacy? Companies with deep pockets and skin in the advertising game can still track you. Anytime a defense is put up, they just pivot to another method of tracking. When you have an army of the world's best engineers and unlimited resources a way will be found. We need to start living with the reality that privacy is already dead. Weep if you will, but at least accept the truth that Mozilla can't protect you, and that your data IS out there somewhere.
This is a fatalist attitude that ignores things like ethics still remaining in developers, the fact that the cat-and-mouse means the defenses ARE working, and the fact that the engineers you are so awed by aren't really magicians.
Yes, there are data breaches and tracking, and it will continue. But the fight has moral and practical value, and I appreciate Mozilla for continuing it.
I agree that this privacy/ads arms race currently favors ads, but all it takes is one law (think GDPR) to dramatically reshape the conflict. Luckily that power still resides with the users.