Not only that, but I saw someone else talk about it and they said that Ludwig has someone on his team (that of course goes with him) who is an exceptionally good engineer. He is responsible for all layouts and custom interfaces that Ludwig uses. He apparently already has things in place to extract data from Twitch like user badges, custom layouts for youtube, better chat, etc.
Explanation was that Ludwig, with his team, was worth far more than the metric of "x people watch, X people sub" that they expect Twitch uses when measuring contracts.
Here he is promoting his stream. Watch till the end. Makes it understandable as to why so many streamers, especially without a massive user base (or a youtube following like Ludwig already has), want to be on Twitch instead of Youtube. Growth is hard if you're not visible.