TikTok's differention is the userbase of all teenagers in the world.
That didn’t by accident though.
It also provides different opportunities for growth compared to other social media. A video that gets over half a million views on TikTok may not get 5 thousand on Youtube, or even 10 views on Instagram or Facebook.
But go just one layer deeper to 'why is every teenager using Tiktok' and the primary answer once again becomes 'Tiktok's recommendation engine'