If it's a app, including fucking tik tok you bunch of morons, that was developed by a Chinese company all of the data on your device is going back to the CCP. It's just that fucking simple people.
That's a bit over the top. The app only has access to the data you give it permission to access. So TikTok may have access to your contacts (don't give TikTok access to your contacts, guys), but it won't have access to your text messages or activity data.