I prefer them to not have ANY information about me - because the holy grail of such system is to dynamically adjust prices, upwards, depending on your preferences. To extract as much money as you are willing to pay for a product.
An automated bazaar system, where prices can only rise for you.
I wonder about the prices rising thing. If one guy wants to jack up his prices for me ... someone else might be smart enough to lower them.
True intelligence is collaborating in raising prices, as everyone wins. An incumbent who refuses to participate can be forced out by systematically lowering prices until they go bankrupt. Always assume something with more power and money than you is going to take every step they can to bully and mess with you, because it has been obvious for a while it will. The whole "the market will fix it" argument is untrue in so, so many scenarios that it's not worth addressing beyond that.
A poor person might get ads for predatory banking products and payday loans, while a wealthier person might get ads for investment products and mortgages or business loans. The latter person might get ads for Whole Foods, while the former gets ads for Dollar Tree.
So it seems like we should either have no surveillance, or the absolute maximum -- most ads are still in that gross uncanny valley.
Google ads are overwhelmingly useless and for years (a decade?) they were outright insulting to my family.
"Accurate" doesn't necessarily mean "what you want to see". The quip of "more relevant ads" sounds nice, but it just means they're tuned to you specifically, not that they're tuned to what you want to see.
As an example, if it is possible to accurately target people with particular voting preferences, it is possible to show them links to articles about how individual votes don't matter and otherwise discourage them from voting.
That's more accurate, but not desirable.
Let me manage what I want to hear about. I can assure you that my engagement would be a hell of a lot higher than when they advertise "thing you just bought" or "we think you're a woman here's a bunch of products related to" (I'm not a woman, I don't buy those products, amazon ... stop it). Or Google "hey here's some stuff from some sports team you googled" no google that's my team's RIVAL... I already told you I don't like them.
Granted advertising dollars come from folks who want to spend them so I'm going to see that stuff, not the other way around.