When your video gets embedded on other websites, a few things happen:
Those websites can generate traffic to your video.
Google recognizes that your video is embedded on other websites and therefore increases its “Authority”.
The higher your video’s “Authority,” the higher YouTube and Google will rank your video inside search results.
The higher your video’s “Authority,” the more often they will display your video in the Features and Suggested Videos section.
This all leads to more organic traffic and visitors to your video, which is what everyone wants!