that doesnt really matter too much.
US advertisers won't be able to pay tiktok. Basically 0 money for bytedance, while plenty of trafic expenses if they keep servicing.
And ofc, apple and google can simply remove the app from your phone.
What? its not worse than a ban, its so not worse that ByteDance could simply not sell its US operations and stop being present in the US, making it just like a ban. A ban would leave no option.
This is pretty much what China does, but for every service.