It is different in the sense that TikTok does not create any content. It is a platform for other young people to post videos. It is like Youtube where people post and share videos. Yes, people can post political videos and spread disinformation on Youtube, just like on other platform as well. Singling out TikTok for this smells more like protectionism. Facebook has more than 2 billion users worldwide and the US has a population of less than 400 million. The majority of the users come from other nations. According to your theory, Facebook posts severe national security risk to all other countries where Facebook operates because Facebook is a foreign funded and controlled company to other countries.