US should call their bluff. If Tiktok gets banned, people will complain for a little bit until people forget and move on to what's next. Why doesn't an American company make something that's practically identical? People will be all desperate for their 5 second dopamine rush that they will download anything.
As I recall, the guy who makes Pixelfed (dansup?) is also working on a vine clone called loops. It looks like the site is https://loops.video/ Doesn't appear to be operational yet.
It would be his first good instinct. But bringing back the domain is t going to bring back the magic. Vine is dead and nothing Musked is going to be any fun.
If I remember correctly from my rabbit hole, it tracks your viewing habits by a far wider list of variables and on a micromanaged scale. It can be annoying if you have someone sending you content you don't like because viewing them will slot them into your feed immediately, but it's just as quick to discard those things. I found it very easy to train for my interests in cooking, goblincore, and irrational humor.
Personally I've not tried shorts, I don't have any issues with it but I've only ever used YouTube for long form educational videos or horror fiction so it never has anything to offer me.
If you have to ask that question you definitely don't use Tiktok it's far far superior algorithmically than Reels and YT Shorts which are both absolute garbage.