The Link to the source-code is actually in the open on the submissions page for your entry.
If it wasn't accessible for other participants, it would miss the main point behind it: Allow others to learn from what you've made.
Viewing post in Confused about source upload? I've got the answers!
I know, this is what we (me and WayfarerGames) talked in this post 🙂.
There is a difference between the Game Page and the Submission page 😉
My idea was that you can submit your source link in the Submission form, you don't need to add it to your game page.