Because TikTok was developed by ByteDance.
https://en.wikipedia.org/wiki/Zhang_Yiming
>ByteDance is the developer of the video-sharing social networking service Douyin (TikTok). On November 9, 2017, ByteDance acquired social media start-up Musical.ly for up to US$1 billion. They combined it with TikTok on August 2, 2018 into a single global application, keeping the TikTok name.
>As of November 2018, ByteDance had over 800 million daily active users (over 1 billion accumulated users) across all of its content platforms.[8][9] The company was valued at $78 billion and is considered one of the most valuable unicorns in the world.[10] The company has an internal committee of theChinese Communist Partyas well as strategic partnerships with Chinese Communist Party-supported ventures in Beijing and Shanghai.
https://en.wikipedia.org/wiki/ByteDance
Lurk moar.