We are not performing a check for ad blocking to display this message. It is being shown to all embed viewers with the intent to reach any viewer with unintended Twitch experiences due to ad blocking software. I can understand your concerns, though this action is indeed to address the effects of ad blocking. We unfortunately cannot provide more detail as to what we are addressing. Many developers and viewers have voiced how intrusive this has been for a number of use cases, so please know we are exploring ways to improve this experience.