Can't have foreigners making money here.
I'm not into social media, I think its fundamentally evil, but its popular and generates revenue. Revenue that should be going into US corporate pockets, not those foreigners. So out comes the "National Security" canard -- its perfectly OK provided we can make the money off it.
Same with Huawei. Its a competitive threat so had to be taken down. Its not just the Chinese,either. Anyone remember what happened to Japanese motorcycles in the 1980s? We couldn't ban them outright, too obvious, so we just taxed them. Same with anything else. (Japanese semiconductors.) We've had a go at Airbus more than once. Its the same tune, just different words to the sng.
Just to demonstrate how low we can go here, the lobbyists are pushing for a $20 billion spend to replace "Chinese Cranes" at our ports. I don't know why we bought cranes from China, we should be able to make them locally, but I suppose there's more money in derivatives than cranes or something.
Anyway, I think the whole TikToc thing is just a way to alienate about 130 million voters, a group most likely to be Democrats. Congress has repeatedly demonstrated that they're -- to use British parlance -- "a bunch of self-interested wankers" who don't deserve the time of day, much less our respect and votes, so to retain the status quo they've got to find a way of getting people to not vote. This is as good a way as any.