Youtube should add a feature where you can't like or dislike a video until you've watched a certain percentage of the video's length

100% would be optimistic, as I myself will admit to not watching the entirety of most Youtube videos, especially ones that have the users outro video, but it would greatly help the Youtube's already cancerous community be a bit more informative to Youtubers themselves, so they know that people have actually watched some of their video before they leave a dislike

Also, the percentage should be decreased or increased based on the length of the video, otherwise Youtubers who regularly post long videos would suffer