It's no coincidence that the leading browser (Chrome) is produced by the world's largest advertising network (Google). And so you ask, why isn't cross-browser

It's no coincidence that the leading browser (Chrome) is produced by the world's largest advertising network (Google). And so you ask, why isn't cross-browser cookies disabled by default? Well... why would a company do something to their free product that reduces the amount of revenue that they earn on their other products.