Since it's (presumably) going to be a free game, it shouldn't be an issue because of fair use. As long as Scratch lets you host it, you're good and just need to link to it from Itch.
But even if it is an issue, this jam is a bit unconventional and you technically don't need to submit the game itself... just the devlogs that prove you made progress with the game.
Mostly, sorry If I keep bothering you with questions. As you probably already know, Scratch doesn't allow horror games/FnaF games of a certain flow rate, so I was thinking to turn it into a downloadable build, I think it would be a great idea. But if devlogs are enough, that's perfect.
Alright, thank you so much for the help.
Now let's wait for the Jam to start to receive all the details!