For me, there are 2 things:
1. I want more honesty and transparency in products and services. I'm tired of being sold something to "Connect with friends and the world around you" that are actually just a front to collect as much information about me as possible to for advertisers.
I'm not even opposed to targeted ads, but at this point have to assume that if a product is capable of collecting ever bit of data it can and selling it, it will. Even privacy policies and user agreements are meaningless because they all contain text of the effect that the provider can change the terms at any time.
I just want companies to be honest about what they are actually doing and what the cost to me really is.
2. I want ads to back the hell off.
I don't mean they need to go away entirely. There are times when I _want_ to learn about different products and find new things to solve problems I have.
But I'm tired of them them pushing to get as in my face as possible, of them beating me over the head with problems I don't have, and of them trying to manipulate me into giving them money instead of helping me find things that will actually help me.
It's as if product discovery isn't profitable; like companies are afraid to be honest about their products. So instead of making better products, they entire market just makes different colored cheap boxes with nothing inside and uses ads to manipulate as many people into buying them before they figure it out.
I block ads guilt free because at this point I honestly don't feel like I can trust any company that participates in this racket.
Personally though, I'm might just be willing to give up on products that depend on ad revenue. While I admit I do use some services based on ad-tech, I'm pretty quick to leave any site that complains about my ad-blocker and don't really feel like I'm missing anything. I could probably be convinced to leave most these other services behind if they started making a worse experience of it.