Dude I clicked on some random Youtube accounts that were streaming the world cup live, and it took me a while to realize that they were actually just streaming video games replica of the actual game (at least, I think they were simulating the actual game with a video game, but I'm not sure as I didn't compare closely)
Someone once did the opposite - streamed a real pay-per-view UFC match on Twitch and pretended it was a game he was playing. It actually worked for a while before the Twitch mods realized what was going on.
