> Or the risk of offending the biggest source of funding?
I (a Mozilla employee) can understand why people worry about this, because there does seem to be a conflict of interest here. But, I've never seen anything to indicate that we consider Google's payments to us in any security/privacy decision.
DNT is not the ultimate solution to tracking on its own. It is part of a solution.
Consider this:
Let's say you go buy a box of doughnuts and take it to work, open it, and leave it open on a table next to your desk. Some people will think "Hmm, I want one of those doughnuts but I'm not sure if it is OK to take one, so I won't" and other people will just assume that it is OK to take one. (Why else would there be an open box of doughnuts? And/or isn't it better to ask forgiveness than permission?)
Let's say you write "Do NOT take these doughnuts! They are mine!" on the box with a big fat marker. If somebody were to take a doughnut, they would be clearly in the wrong in that situation, according to any kind of mainstream social convention.
Lots of people will say that it is wrong to take a doughnut without explicit permission. But, many, many people see the situation as being open to interpretation.
Now, let's say the doughnut shop pre-printed "Do NOT take these doughnuts! They are mine!" on every box. You might argue that that is the same thing as the hand-written sign. But, I would bet that the pre-printed message would get drowned out as people would normally share doughnuts out of these pre-printed boxes: "Just ignore the box, they all say that; it doesn't mean anything." The pre-printed message becomes less and less meaningful, even though the words are clear, unambiguous, and explicit. And, worse, you may be discouraged from writing your handwritten ""Do NOT take these doughnuts! They are mine!" message on the box because, well, the box already says that. Effectively, that message pre-printed on the box is harmful, as its meaning is in the eye of the beholder--just like the open box sitting on the table with no message written on it at all.
Do you see how that could possibly be problematic? This is the problem that Sid and others at Mozilla are trying to solve. "DNT: 1" means it is clearly wrong to track this user because they've gone through special effort to tell you they don't want to be tracked.
It has nothing to do with Google's money.