I don't use TikTok myself, and I still remember the first time I saw someone swiping through video after video on their phone, and I could only think a) how utterly dystopian it looked and b) how much it was probably crushing this person's attention span.
I was a user of it for about a year and had to go cold turkey— I uninstalled, removed my account, and haven't touched it since, though I still follow a few of the more thoughtful creators who I found on there via their FB and YouTube presences. Fortunately for whatever reason I don't find it as challenging to avoid falling down a hole on those other platforms— like I can see that creator X posted something new, I can watch it, and then immediately go do something else.
It probably also helps that in most cases the short form videos aren't the person's "primary" output, but are teasers for longer-form content like video essays or podcasts.
But yes, the overall picture is extraordinarily dystopian, and it particularly preys on people who already struggle with attention management and guilt around productivity.