It's one thing to do a paid promotion through a promotor... but to lie and act like it is their own money they are gambling with.. It's not only immorally wrong, it's possibly illegal depending what jurisdiction the streamer is in.
As long as they are not saying it openly they are not commiting anything wrong from the legal perspective but it can be immorally wrong but why does someone choose to spend their money because they saw a streamer is making tons of money by doing the same, which is actually greed driven activity right so those streamers are using the people's greed to make money for them.
They can lie to make money, all they care about is the legality, as long as they are safe on the legal side they can do what the promoter would like them to talk and promote, that's why it's hard to trust those who are promoting online, I would still prefer a forum like ours as we can see the transparency we are looking, no bias opinion will prevail and etc.
They wouldnt really care at all and its true that as long they dont make some legal lapses or violation then it would really still to continue since they do know that theres nothing that would happen to them despite of
being that deceptive in terms of marketing as long on whats been mandated on them then they would surely follow as long they do make out money then that what matter the most.
As a gambler or viewer then you should be at least using your own common sense on judging off things.