PS Not sure why I get 0 points here :) I have it on good authority from some webmasters that were trying to offer non-tracked ads that advertisers simply don't want them anymore.

They're so addicted to tracking, and 'retargeting' (meaning repeat ads) that they're just not paying for untracked anymore. Not nearly enough to make an ad-supported website work anyway.

Due to GDPR and the cookie ban, things are turning in Europe though. Because now they no longer have the choice.