That will still appear on the jam entry page! From talking to the hosts, it seems like the whole point of the source upload is that other people can learn from you and see how you've done things.
A game made during a jam should contain exactly 0 lines of production-ready code 😉 making a game in 10 days means you're going to be doing a lot of things very quickly. If you want to turn your jam game into a commercial project, start from scratch. You'll have a better idea of the requirements for the systems you are designing, and you'll make a much better game!
That said, even if you DO reuse code - who cares? What does it matter to you if someone wants to do the same thing in the same way? You're not going to making the exact same game, people work completely differently and have different ideas about what is fun. And even if they do completely steal your jam code, you're not making any money from the jam game anyway - you don't have to continue to update the repository!
People should stop being so defensive about their code, seriously 😂