Initially, TikTok limited the length of videos to 15 seconds, but now that the social video service allows videos up to three minutes, it makes a little more sense to have it on a TV. Of course, the TikTok videos tend to be filmed vertically, which isn’t necessarily ideal for watching on a 16:9 TV.
The app seems well-made. It has support for the following, for you, and discover page. It also supports autoplay, so the Fire TV will jump from video to video without you needing to sit there and press a button to go to the next one. It makes it so you can just put TikTok on the app and let it play without manually doing anything.