~snip~
But hey, it really happened. I saw that on several YouTube when the streamer was playing live gambling, and there was a chat next to the video. People on the chat say to join for free money, which will be chosen randomly.
There are even streamers who invite people who watch their broadcasts to join. Well, perhaps they were toying with the people watching their broadcast. But if we don't join and just watch, that's okay too, right?

Even if you see something like that, it doesn't mean it's actually real.
The streamer could easily just login there with another username, and send money to himself, or a friend, etc, to create the idea that it's working.
It's pretty common actually to see things like that when they want your money. It makes it more attractive for a lot of people to take the bait.