Tiktok isnt even a new concept though, youtube, vines, facebook, instagram, snapchat etc all all did it before them. What made tiktok so successful is the software they have to create the videos/content is combined in the app, and the algorithm is much better for targetting the videos to the right users. But the concept of short "instant gratification" content isnt new. Youtube shows that peoples wants changed, from short content, to longer, to shorter, to having options. Alot will upload the short content to tiktok, and longer to youtube even to this day. It is seen by the audience most suited to the content.
What tiktok has done differently, with the simple to use software for creating, is allow a massive amount of people, who didnt have the knowledge or access to youtube video editing software, to make content and connect with people. If you only watch one video, go watch the recent post on the official tiktok page. The middle aged man with parkinsons talking about how its opened up his world. The young woman who received a kidney donation. The elderly lady who is a carer for her husband who used the ap to connect with the outside world, the users who gained a diagnosis for conditions, the people who found they were not alone in what they were going through, the small businesses that are successful from soap makers to artists, the people doing things in their communities to make their shared lives better.
Tiktok is so many things to so many people, and in your world, it may not matter, but in the worlds of people, whos lives are limited for whatever reasons, its opened their world for the better. Its sad people cant look past their own experiences and see those of others.