Whoever uploads the video gets to choose weather those boxes appear at the end of a video, how many of them, where on the screen and what size they are.
They are an additional way to get people to watch more of your videos. why people put them in places on the screen that will annoy their viewers is beyond me. I've got to the point of creating videos with spaces where I want the box's to go.
I think the only plausible way to win in the crystal dome is either to go in wearing combats and stuff the silver tokens in to the pockets to get them out the way or have one block nominated to have all the silver tokens stuffed in to his T-shirt.