You can't. Every call you make to a server includes your browser's user-agent/client-hints as well as your IP. Those cookie consent screens are provided by 3rd party but integrated via 1st party. So the company's website you visit doesn't even have to know it's going on, all they have to do is setup the MarTech correctly with the vendor and create a DNS entry. This, while being used to track you, could be used for good - it's not. Some companies are trying to own some of this to prevent nefarious uses of the data but in the end it's been the wild west of data tracking for the last 10 years or so.
Challenge: Open up your favorite website (not HN :D) and watch the XHR's and network calls in your browser's devtools. How many of those are for the same origin? How many of those are ad calls being blocked by your extension (which also has access to your data)? How many of them are calls for a single pixel gif? Some javascript? favicon.ico? Do some spelunking on WHOIS for each of those domains. All it takes is one of them to proxy the headers. Proxy the headers and check if ad was served by looking at logs of both ad request and page request, if no ad request was found, require them to disable adblocker...
