While I can relate to that, one of my favorite youtube streamers is Xposed. He curses a lot and his emotions are over the top sometimes but it is just so fun and entertaining to watch lol. Not the best example sometimes also for responsable gambling as he places somes crazy bets sometimes.
Friend, it's only natural that your favorite YouTube like Xposed dares to bet crazy because he has income from YouTube that can be used for betting, after all by doing this he can attract more viewers to follow him.
One more thing to remember, even though he lost the bet, the loss was not felt because it was covered by his income from the YouTube channel.
But it's true what you said, we can only watch him to get excited and learn that gambling crazy can have a very big negative impact and you shouldn't copy the betting method he has done.
You are absolutely right, YouTubers have mislead many gamblers into wagering amount of money they weren't ready to lose, and eventually lost it and it became a big problem for them, I have a friend with such an experience and I tell you that it's not funny.
I've once watched a gambling livestream on youtube, I never had any plan of gambling that day, but after watching the livestream, I start feeling like it could be a lucky day for me, I deposited money I was supposed to use to attend to some really important, hoping I would win and withdraw the money back plus profit, I eventually lost all of it, since that, I stopped watching gambling livestreams, or any video related to gambling which is not about pure gambling education.