Or just ban this kind of data collection. Is there any reason anyone would willingly click "Accept" when a website asks to share your data with 500+ partner sites?
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No one wants to be advertised to, but powerful lobbies argue that ending ads will lower consumption and thus harm the economy; and no politician wants to lower GDP.
No one wants to be spied on, but powerful lobbies argue tracking people allow better security; and no politician wants to be soft on crime and terrorism.
I doubt that. People tend to spend their money regardless. Advertising just determines what they spend it on.
Advertising is only used heavily when all products are similar, otherwise the best would naturally rise to the top.
For example, washing powder/liquid is advertised heavily on TV, yet do you really believe one brand of powder/liquid gets your clothes cleaner than any other?