"Privacy concerns have also been brought up regarding the app. In its privacy policy, TikTok lists that it collects usage information, IP addresses, a user's mobile carrier, unique device identifiers, keystroke patterns, and location data, among other data. Web developers Talal Haj Bakry and Tommy Mysk claimed that allowing videos and other content being shared by the app's users through HTTP puts the users' data privacy at risk In January 2020, Check Point Research discovered a security flaw in TikTok which could have allowed hackers access to user accounts using SMS. In February, Reddit CEO Steve Huffman criticized the app, calling it "spyware," and stating "I look at that app as so fundamentally parasitic, that it's always listening, the fingerprinting technology they use is truly terrifying, and I could not bring myself to install an app like that on my phone. Responding to Huffman's comments, TikTok stated "These are baseless accusations made without a shred of evidence. Wells Fargo banned the app from its devices due to privacy and security concerns".
So, you can add this application to many others that are mining data for their use and our invasion of privacy. This is another good reason to read the "terms of use information before you load an application. I recommend that you read the full Wikipedia article and the data with all material that you load onto your device.