I had no idea Doki Doki started on here! 0.0
I've never heard of Baba is You, so I'll have to look that up.
Me neither. I had to check the release date and age of the account to be sure. But I did not check, when they submitted to Steam. As far as I remember, there was or is some kind of greenlighting process, so it could just as well be, that they did try to release on Steam earlier and on Itch they just released as is. But their account is old enough to claim they started on Itch.
Baba has this Nordic Game Jam tag line on it's splash screen. But that games from this jam are on Itch is not something anyone not familiar with Itch would know. https://itch.io/jam/ngj17
Something more recent would be Backpack Hero. Not a jam game, but their web and dl version was on Itch long before it was released on Steam.