If it's gonna happen at all, there will be a law enforcing that, because it's not in the interest of website owners (which also leads to the dark patterns in the dialogues).
If there is law, people can sue, which usually is enough for companies to (usually) follow it
> Climate change is causing distress, anger and other negative emotions in children and young people worldwide, a survey of thousands of 16- to 25-year-olds has found.
> The results, released in a preprint on 14 September1, found that most respondents were concerned about climate change, with nearly 60% saying they felt ‘very worried’ or ‘extremely worried’. Many associated negative emotions with climate change — the most commonly chosen were ‘sad’, ‘afraid’, ‘anxious’, ‘angry’ and ‘powerless’ (see ‘Climate anxiety’). Overall, 45% of participants said their feelings about climate change impacted their daily lives.
I consider this a good thing. Wasting energy ain't good, especially when it isn't completely climate neutral