I'm going to start with a rant and then give you the solution you're asking for. Think of it as an advertisement for privacy. CTRL-F for "Here's a solution" if you need to, but you should read the rest.

All advertising was "clean" at some point, consisting of just images and links. Web advertising changed direction at some point, following the money vendors paid them. And it's absolutely impossible to guarantee that owners or investors won't change policies later. Even if a company says that they'll never do it and put it in the TOS, they can still change it at a later date with no repercussions. Even doing something outside the TOS has few consequences, so sites and ad companies can lie about their policies. Which would be cheaper than actually reinventing themselves. So, thinking about it like this, your incentives aren't reliable and will likely expire at some point in time, rendering this approach useless.

Expecting users in various industries with various levels of skill to have the motivation and expertise to clean up your industry for you is beyond ridiculous. Each individual user has such a low financial impact on final ad revenue that it would take a social movement beyond massive to have any reasonable effect.

You're really targeting the wrong audience, here. There either needs to be some type of reliable third-party (if that's even possible, given the corruptability of this industry) who tracks ad network reliability, or vendors need to incentivize clean ad networks by not buying ads on networks that allow for exploits. You need to either self-regulate, or eventually be forced by regulation (either legal or through ad blocking). If there was a reliable, trustworthy industry clean up solution that didn't revolve around people paying to remove demerits (e.g. Yelp review), maybe we could all stop furiously ducking ads and see what's left after the adpocalypse.

Here's a solution for you. Perhaps an enterprising "clean" ad network could build an extension that checks pages for third-party-hosted javascript, hidden images, and all the other tracking/exploitation techniques and rates them with an icon. That would be a far better way to market, as long as they don't try to exploit that gained goodwill. Post it on Github, keep it open. Base the entire thing about tracking sites that (directly or indirectly) use subversive techniques. Rate them and give them a black eye publicly, and include a public appeals process. This has to be automated and updated so that they can't get around it with new exploits. Build the results of this into a list that can be used by adblockers directly. But even without disabling ad blocking, you could see from this extension at a glance which sites operate in a non-user-hostile manner.

EDIT: This solution here means that users don't have to "check" to see which sites and platforms are clean. They opt-in to find the information, and then it shows up on whatever site the see. All major browsers have been adding support for Chrome-style extensions. And I can find this information out before disabling ad-blocking, and be notified of sites that have significantly worsened. Seriously, if serving ads is something you want to do, I can't think of a better way to increase reliability than this. Also, you can't use this extension to track users, either. Even anonymously.

Once again, users shouldn't have to go seek out clean advertising. There's literally no incentive at all for someone to say, "I want to see ads, so I'm going to spend hours investigating agency practices and which servers belong to which agency". And there never will be. As a user, it would cost me hours of time to educate myself, and I'd have to do it repeatedly to keep aware of which companies are toeing the line this week. All to earn you a few cents out of the goodness of my heart. The people who are buying and serving ads need to clean it up, or risk it collapsing around them. And they really should not expect sympathy or understanding until it's no longer risky to offer it.