I really hope an analytic genius can come up with a technique (like differential privacy, but I'm no expert here) that would give advertisers what they want (un

I really hope an analytic genius can come up with a technique (like differential privacy, but I'm no expert here) that would give advertisers what they want (unique visitor counts, and very few other metrics) to place ads on sites, yet doesn't give away too much privacy, nor leads to enslavement under a single central entity. I guess if something like that doesn't come along, then only old school content-based ads (site sponsoring) without any tracking can be considered ethical (or no-ads of course). The argument against content-based ads was always that it doesn't suffice to finance even web hosting let alone content production. But with ad prices going to the bottom, I wonder if the figures still add up in favour of targetted ads today.