Why one stable link changes things
When you have a single link that never moves, you can put it everywhere: your TikTok bio, your captions, your other socials, your thumbnails. Your audience starts to know it by heart. You stop losing clicks because a link changed or because the right destination was not front and center that day.
That single link does not point at one fixed destination. It opens a page, and the page holds all your links. You change what is on the page as often as you like, and the URL stays the same. That is the difference between a throwaway link and an address that becomes your signature.