If you're wondering why you can't copy a link from TikTok, it's because the app doesn't allow users to do so. This is likely for a number of reasons, including preventing the spread of misinformation and protecting users' privacy.
While there are workarounds that allow you to copy links from TikTok (such as using a third-party app), it's important to note that these methods are not endorsed by the platform and may not work reliably. If you want to share a TikTok video with someone, your best bet is to use the built-in share options within the app.