“SELLER of advertising, not a buyer. “
You still do not get the advertising industry model at all.
X sells advertising but gets it from advertising management companies who refuse to transact with them.
You should take a class in economics and civics.
I get economics just fine, thanks, but you seem stuck on the idea that advertisers have an underlying obligation to spend money on placing ads with advertising mediums with which they disagree.
If X featured bestiality would Proctor & Gamble be forced to sell soap on it?