Everything you wrote here is right. Casuals and Youtubers have no business trading crypto until they learn enough to get certified in finance and investing.
I think it's not their fault, it's the viewers who have no idea who to follow. They fail to understand that these social presenters are making money out of the view and subscription, not by investing or advising any financial advice. They are good at video editing, and holding the interest of their audience.
Royse is right here, they Blackjack.fun have been around for a long time and there have been no serious complaints about them, at least not on the forum. This gives a certain amount of trust.
What is debatable is what this staking is for, because the investors' funds do not participate in the casino bankroll, the profit does not depend on the winnings, and there is also no risk in the case of large winnings of the user.
Royse777, keep in mind that their withdrawal fee is quite high, for example, currently, it is 0.00288081 BTC. Although the staking funds are not locked, it is certainly not an option where you can withdraw funds whenever you want.
I know the fees sucks. Recently I saw they have sportsbook which means there are a need for bankroll. Before it used to be the blackjack tables only. Any investment was meant to improve the project development.