Based on the theory of news "proximity," it is perfectly understandable that CNN doesn't have the ratings of the Chinese-language CTN, and CTN doesn't have the ratings of Taiwan-based TVBS.
以新聞「接近性」的理論來看，CNN 的收視率不敵說華語的 CTN；CTN 則拼不過經營總部在台灣的 TVBS，也就可以理解了。