How do schools check for plagiarism in their admissions essays?

I know that some schools use turnitin to scan essays, since i use it at school too. However, i’m kind of questioning how this would work out? I submitted very similar essays to multiple universities in my early app, and even ran my essays through turnitin myself to ensure i wouldnt have any plagiarism issues. However, Wouldn’t turnitin pick up my essays as plagiarized since its already been submitted on the website before? How does this work out?

On another user’s question about a different plagiarism-checking app, there was something in the info about the app that said your essays aren’t publicized after you run them, so they won’t turn up in another user’s scan.

Plagiarism is stealing someone else’s writing, not duplication.