heading this off at the pass: no, JLCPCB's ToS do not grant them the right to reuse or sell your PCB designs. read the full text to understand the context and purposes applicable to the rights you're granting them, not just one isolated sentence, and think about the functionality of the site (e.g. generating gerber previews from your uploads, storing uploads in your account's file manager page, publishing customer reviews, etc.) and what rights must be granted to support that.

#electronics 

 @f3ad697a It does clearly say they can use your design for AI training, which you can't opt out of, and which also means that they will keep your files forever as part of their training dataset. I don't think that's okay.