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The question is to yourself, did you ever watching a streamer or youtube gambling? Is quite normal went they got a promotion, nothing wrong with that but just don't surprise when some streamer playing with big money.
Here:
https://www.youtube.com/watch?v=lx58B-D4aoQ from Juicy, I watch him even he got sponsor money cause is entertainment nothing wrong and the important the result is real that all even that came from sponsor money.
In his video description, he give description
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*THIS VIDEO INCLUDES PAID PROMO*
Yes this is also a promotional scheme of the casinos in which they provide a balance to the youtube streamers who have good subscriber base and they show they are winning high amounts on particular slot and players get attracted to that casino in hope of winning.This is old technique and discussed many times here also.I think there are many Youtubers like @xposed who are paid to play on different casinos and they will automatically tops the chart.