Unless it's something like DougDoug's streams where the chat has a direct impact on the gameplay of the player, they otherwise shouldn't be reading chat anyways: Blind playthroughs risk spoilers, PvP risks people giving away strategic info, and it's a distraction to quality gameplay.
I don't get watching twitch streamers that have chat open. It's:
Unless it's something like DougDoug's streams where the chat has a direct impact on the gameplay of the player, they otherwise shouldn't be reading chat anyways: Blind playthroughs risk spoilers, PvP risks people giving away strategic info, and it's a distraction to quality gameplay.