Yeah, they failed to communicate it. Which people chose to interpret in the most uncharitable way. "Never attribute to malice that which is adequately explained by stupidity." - Hanlon's razor

Misconceptions about Firefox's Privacy Preserving Ad Measurement – Andrew Moore

Of course people who complain about this loudly are most likely people who block all ads and tracking anyway so it doesn't even affect them. My ideal would be the total ban of all advertising. Then let the free market sort it out lol.