Rational from what perspective? The US is a top market for TikTok in terms of revenue and users. Bytedance isn’t just some cohort of Chinese bureaucrats with bottomless pockets sitting in Beijing. Its major investors and BoD include large global VCs and individual investors who are not going to walk away from a successful app that prints money. Ironically the way TikTok’s presence is built and audited by Ellison and Co in the US is far more secure than if it were sitting outside of the US.