To each their own I guess, but I do not really gamble at slots as at least to me it is a very boring game, as you barely do anything except placing your bet and pushing a lever or pushing a button, so I could not picture myself watching someone else streaming about it as that would be without a doubt even more boring regardless of how interesting they tried to make it to be.
Personally I prefer games like poker or blackjack in which you really need to think about your next movement instead of relying solely on your luck, as it is the case of slot machines.
Slots are the most interactive and engaging games in a casino, that is the reason why they are the most played casino games to ever exist, I don't know why you find slot machines boring when they are pretty fun to play and watch as well, especially if someone you are watching is playing with high bets and buying bonus spins, I really find that fun to watch when a streamer plays a slots game where buying feature is available and they do it with very high bets.
And I don't really see how one can think about their next move instead of relying on their luck when playing Blackjack when it's clearly dependent on your luck since you don't know what cards you are going to get and your total game is based on what you are going to get initially and later when you have to hit.