This way, they all look similar when you scroll through the category. However, many content creators stream the game very simply: with gameplay, a microphone, and maybe a webcam on top. If you look at the category for it on Twitch, YouTube, and the like, you'll see that other people are also playing the same game. Let's say you're watching someone play a popular game.
Game overlays are easy to understand once you've seen an example, especially if you're familiar with the world of streaming.
