1. Copyright issue: Tik Tok has a copyright review mechanism for the content uploaded by users. If beauty videos involve infringing or illegal content, they will be deleted or hidden.

2. Users delete their own beauty videos: video authors delete their own beauty videos themselves, or set them to private status, which can only be viewed by specific users.

3. Algorithm recommendation: Tik Tok's recommendation algorithm will recommend relevant video content to users according to their interests and preferences. If there is little or no interaction with beauty videos, Tik Tok will recommend such videos less.