The simplest case for banning TikTok is simple reciprocity. China is no longer a market that needs the level of protectionism they currently have to develop. The second best is data privacy. Just a shame they won't apply the same to US companies yet. And then an additional reason is the one that's being used currently - risk of foreign influence. You'd hate to not ban it "because it hasn't happened yet" just for it to happen in the future. China keeping out US apps seems to have worked out great for their local industry, I'm hardly convinced it wouldn't also be a good thing for US citizens. And with the foreign-country thing tossing Constitutional issues out the window, go nuts.