Ultimately US tech firms didn't make effort to follow PRC regulations while PRC tech firms tries to follow US regulations. If goal is to kick PRC platforms out of US i.e. when current rules doesn't generate desired outcome, change the rules to at least uphold the pretense that US cares about "rules based order". It's an optics issue. If US wants to ban tiktok, better to proceed via a less authoritarian lawfare route, because unilateral sanctions (which even PRC hasn't done on US platforms) are more likely to invite blowback down the line when other countries want to curtail US platforms in the future. But short term it's the optics, US going HAM on sanctions/export controls, especially ones that affect rest of world - which I'm guessing longterm goal is to get TikTok off Android/iOS - makes US behaviour much worse than PRC in terms of extraterritorial shenanigans.