TikTok (formerly Musical.ly) when initially came out, there were heavy information leaks from all around the globe all about people's personal information. But then they did updates which now make it quite safer than earlier.
TikTok has a section for Likes which now are private (locked/not viewed publicly). Earlier this section was publicly accessible. Lets say you liked a video of a creator "XYZ" and then "XYZ" deleted it. Despite that you would access it as it would be stored on somebody else's likes causing some issues of privacy and piracy.
Lets say you want to view a profile. Search for it. Once you get it, right click on the image Profile picture (if any) and open in a new tab. From here you can easily conduct Reverse Image Search .