So they need to change the first couple bytes then, automatically. Essentially I don't understand how possibly could free adblocking lists defeat advertisers o

So they need to change the first couple bytes then, automatically. Essentially I don't understand how possibly could free adblocking lists defeat advertisers or trackers if they truly cared about them: simply have a system running with the latest adblock lists against their test site, and if it is able to filter them, have an engineer make a modification—or have the system automatically pull up a pre-made modification or even generate a new one. In addition, the content-driving JS and the site JS could be bundled in one and obfuscated. Best functioning filters are secret ones and thus only the technically minded minority has access to them.