I think it's a combination of the old news, how expensive hosting video is compared to anything else, and how Twitch is basically a boat - a hole in the water that you throw money into.

People lose the connection that burning money like it's going out of fashion is only step one in the game. Step two is capitalizing on the market share that you acquired in step one. And, as every social media company has shown, ad revenue and data harvesting are very profitable. Otherwise, every tech giant wouldn't have pivoted to that years ago.