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There is no problem with content creators trying to make some money through views or partneships with casinos, but it should be a must to let it very clear to the audience, so everyone knows what is going on and what are the real intentions of the respective video in exhibition. When nobody feels like being lured or tricked, the marketing campaign works much more efficiently on long run.
If it wasnt working on the first place then we wont really be seeing it to be used in todays era or situation which we are seeing the opposite.When it comes to marketing then these would be the primary mediums on where companies would allocate some budget on because we are on a digital era
which its sensible for them to have on this method.
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Whether an advertisement is working or not is hard to say, especially when you advertise in many places simultaneously. Big companies, slot providers in this case, normally spend as much as they can and more on advertisement, not because they want to expand, and make even more money, but because they want to stay afloat. "If you don't grow, you die", this kind of thing. So they pay big money to popular internet people to stream playing on their slots.
It isnt just that ethical if they would really be making those decieving kind of advertisement because they would know that it will really backfire on them.
As for advertisers or influencers had made out their own personal choice on altering something then thats a personal problem of course.
I've seen a lot of such streams, and I don't think they are altering anything there. What they are doing is showing "the most interesting moments", and of course it's about big wins. No one wants to see someone losing constantly. It's boring.
From an ethical standpoint it's not wrong as long as they are not saying something like "You are guaranteed to win big money(or any money) on this slot!". But if they are just showing lucky moments, you have to be a fool to think that there are no others.