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I have always seen poker in a different light, in comparison to other games like slots, it takes actual discipline and some strategy to Excell at poker, there is some strategy on it. Besides, taking online lessons is different from just sitting that see someone play.
In my opinion, Slot streams are rather more about advertisement than entertainment. It is more likely someone would feel like trying the same casino and slot game they have seen on a stream, instead of going for some random option.
At least, while watching poker one can learn, right? There is no much to learn in pure luck bases games.
What you say is true. Indeed, we will not learn much from games based on pure luck and just feel the game. But that's exactly what people expect to get entertainment from playing slots, and they don't like games that are skill based because they might find it hard to learn. But as you said, we can learn by taking online lessons to understand how to play poker well.
And I think we also learn to play poker from streaming shows on Youtube or other sites. But all gambling games require discipline to anticipate losing a lot of money. And while enjoying the gambling game that we play by limiting the use of money.