I'm not ScoreSpace but I can verify that the jam has moved this jam primarily to itch due to the problems many faced with uploading their projects to gamejam.com. I hope that helps.
ScoreSpace has hosted many game Jams that were on itch as well.
Here are the links to some of the game jams they have hosted on itch.
https://itch.io/jam/scorejam4
https://itch.io/jam/scorejam5
https://itch.io/jam/scorejam7
