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Discord FAQ:

Is AI allowed?

AI is allowed only in an assistive capacity. You can use AI to help with coding, debugging, ideas, writing, or other support. AI should not make the entire game for you. The final submission should still be your own work.

Only file is fine, only consequence is likely less people checking it out

It is allowed. Quote by jam host from Discord:
"Pause menus, settings, UI buttons, and menu navigation can use normal controls. The one-button rule applies to gameplay only."

You are limited to a on / off

Most jams either are there for getting opinions on your game, or to get some sort of reward.

In the first category, it makes no sense for people to evaluate what AI has done (a pure art evaluation would likely not be a game jam or it would be a specific one).

In the second, it's like a photography competition, of course, you can either generate or edit a perfect image, however it misses the point of it being about showing the most skill / the actual photo taking. Game competitions with mostly AI use would be more about the quality of workflows / prompting, which most likely has it's own jams and/or similar events.