I remember the tedium of non-targeted advertising---it's what ultimately pushed me away from most traditional print and broadcast media and online. Targeted advertising occasionally brings me information I actually want; non-targeted advertising feels like such a waste of everybody's time.
I hope someone takes on the experiment of opt-in GDPR compliant ads.
I'm sure you considered all the poor people across the world that are subsidized by the ad driven model we use today. What we truly need on the internet is data gated behind pay walls to protect important information such as which facebook groups you clicked like on.
A lot of them are poor, because we don't want to pay a decent amount for the products that we consume and instead rely on people working in sweatshops in third-world countries.
You don't solve poverty by giving them 'free' products that require them to give you all their private data. You solve poverty by giving people a decent wage, so that they make these decisions themselves.
Obviously if ads are less targeted then they may be less effective so advertisers will make less on ads that cost more. This will hurt their bottom line, which in turn will make the products we buy more expensive. But that's exactly the end goal. I want to pay for things (information, products) with more money rather than with slightly less money and all my integrity.