While gambling online is a great option there are also fake casinos who offer huge bonuses to scam their users.
We at least didn't have fake casinos in the real world.
If you want to be sure that you're playing in a legit casino, check the reputation and reviews about the casino established casinos have promotions and good reviews and feedback coming from trusted casino reviewers, and only play on casinos with announcements here, there are few casinos in a real world because they are under compliance and the authorities are taxing them, they have their license revoked and stop their operation if they scam their players.
Yes, I think there are many dishonest land based casinos in the world, especially in places with no regulation, or where the regulators can be bribed. I wouldn't say that the situation has become worse in this regard with the appearance of online casinos.
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I do not see this as profitable, getting referrals is something that is not my thing, I prefer to work doing other things, whenever they are referred they are conditions that are required a lot and it is not something simple, generally they are things that are required of the referrals make investments and not all referrals are willing to do so,
if the casinos make this option they will not have very good results. I have only seen in other cases things like referrals in binance.
Idk, it depends on how many high rollers someone can make his/her referrals. It's a known fact that some gamblers earn a lot from their refs. But, of course, it's a hard task, and only a few succeed in it. But, then again, if only a few succeed in winning the jackpot, it doesn't mean there should be no jackpots, right?