Wasn't Isolationism the practice that was strongly, negatively spoken about when people were going through middle and high school as "the way to fall behind"? and "what all those people that didn't advance did for centuries and it harmed them"?
And that, which I also disagree with, is different, still. With TikTok, US citizens were not banned from using the app, or downloading it from overseas.
ByteDance had an opportunity to sell TikTok to any company that isn’t based out of an enemy country that is known to have taken actions against the U.S. and its citizens.