Maybe this is something I'm not seeing in jam settings, but it's consistently a problem- Every jam I've hosted, people submit games that were uploaded to itchio well in advance of the jam's start date. Sometimes years in advance. Game pages with uploads from years before- submitted for a jam that started not even 24 hours ago. 

Honestly that seems like a big oversight and it goes against what a jam even is by allowing it to happen without some sort of automated check. I get that games can be disqualified manually, or that people can just make a new game page and upload, but the fact that they can submit whatever they have regardless of when it was uploaded really shouldn't be possible to begin with. Personally I'd rather see the burden of effort to fall on the people attempting to grift off of a jam instead of just allowing it.

Anyway back to the suggestion part of this post- maybe an option to choose to allow this or not? I'm not sure there's even a reason this should be possible, but if there is it'd be great to choose to turn that off.