seems to be there for me, next to the full screen.

one thing i've noticed though.. for example, the latest ranking of fighters video isn't playing via the GB player but is instead playing the youtube video, and there is no option to switch over to the GB player, suggesting the video hasn't been uploaded and is instead using youtube player instead. in this case, the embiggen button isn't there.

bombcast video, on other hand, is uploaded to both youtube + seperate version uploaded to giantbomb. the youtube version has ads as part of the video, but the version uploaded to giantbomb does not have ads (but an ad will play if you are not signed into your account). in this case, where the video is actually uploaded to giantbomb, the embiggen button is there.