As far as I know on this matter, not all gambling platforms are hosted by Twitch, rather those hosted by Twitch are only unlicensed gambling live streams that are no longer available on Twitch.
And from what I saw, it started to be implemented last October 18, 2022, so the only gambling platforms that can live streaming using the Twitch platform are licensed online gambling businesses.
What I think of all this is that Twitch killed the goose that lays the golden eggs, not only because it banned a casino of the caliber of stake.com but it is limiting things a lot, and from experience I know that when a site gets like this it goes bankrupt very quickly and no one will want to enter, no one likes limitations when it comes to money and more than that it is favorable to people, I don't know what or why they made such a bad decision, things could have been It turned out differently, however they preferred to go the way where a conciliation is not possible so that they can get a better deal, something better and an opportunity for the casinos that have always been faithful to the platform.