~snip~
A professional will not say they are a professional gambler, but it may show how they say something or words. Also, if you watch from Youtube, I think a "professional" can trick you into providing a well-arranged video to make him look like a professional gambler.

A streamer who wants to make money from YouTube videos will invite people to join but no further explanation from him. And unfortunately, the invitation from the streamer was taken too seriously by the people who watched it, so they finally joined and spent money on gambling.