Ad agencies basically black listed pewdiepie from being the face of YouTube and googles like "yeah sure whatever you say just keep the money flowing"
It's a systematic problem that leads up to out of touch business men running companies like coke and Pepsi etc dictating what's ad friendly and what's not because they will not support something that is not in their company's philosophy. Example would be when Pepsi found out about moonman being monetized by them they pulled the plug on YouTube ads for a whole year until they came back for kids channels and somewhat to the rest of youtubers.
Ever since the moonman incident ad sense on YouTube has been crippled to a shell of what it used to be 2009-2015