Better than making it optional and opt-in only, don't add it in the first place. AI is only going to be a negative-sum game, and you will never be able to recoup the cost. It simply will not be worth it, and you will have stolen user data and biometrics for negative returns. EDIT: I will never use Twitch whatsoever for people who allow AI training, and will not use it myself if it's mandatory.
Better than making it optional and opt-in only, don't add it in the first place. AI is only going to be a negative-sum game, and you will never be able to recoup the cost. It simply will not be worth it, and you will have stolen user data and biometrics for negative returns. EDIT: I will never use Twitch whatsoever for people who allow AI training, and will not use it myself if it's mandatory.