Side note: Tracking is an unfortunate reality in today's market. We use Google Analytics for statistics because anyone that even thinks about partnering in any way wants to see that. They don't trust your internal stats as a general rule, since you could easily fake them. So, anyone that fully blocks tracking (Google Analytics et al) is looked at as sunk cost since you don't count as a user in terms of potential partnerships and you cost money in terms of machine time and bandwidth.
I'm personally not a fan of this sort of tracking and wish there was another commercially viable option. I make donations available for folks who want to support the site directly. Even though we have a passionate community and many of them make donations, the unfortunate reality is that without the ads, I'd have to shut the site down. Either that or turn it into a paid commercial product, vastly shrinking the userbase but increasing the revenue, just to keep it going. I'm exploring some paid options, but many of them require a decent sized upfront capital investment that I don't currently have access to.
For those looking to jump into direct sales and self-hosting, my suggestion is to create a second position of an ad unit you sell through a network and try to sell that without removing your existing ad network unit. Then work to contact the people who advertise on your site through the network and try to sign them up directly.
Chances are you can save them money while still bringing in more revenue as you no longer share revenue with the network.
Would you consider hosting your own ads? Is that still a thing? Trust isn't transitive, so it's still a problem even if we're OK with you in particular.