Actually, the German copyright law explicitly allows people with limited vision or with limited reading ability (not defined precisely in the law) to use assist

Actually, the German copyright law explicitly allows people with limited vision or with limited reading ability (not defined precisely in the law) to use assistive technology in order to transfer a work into a more accessible version¹. So, ad-blocker companies might argue that they are just providing assistive technology to people with diagnosed ADHD. Copyright holders would then need to go after the users of such software. (IANAL) ¹) https://www.gesetze-im-internet.de/urhg/__45b.html https://www.gesetze-im-internet.de/urhg/__45b.html