This is a myth. Most streamers do not use fake money. None of the streamers I listed play with fake money.
You are talking only about the large streamers who play on Roobet - who most definitely are using fake money such as Xposed. Their reactions are ingenuine I agree. However, the majority of streamers play with 100% real balances (called 'raw' balances) which they can withdraw at any time and is the same as if you deposited to a casino.
Is sponsor money, sponsor money they add your balance to real account but cannot be withdrawn or depending on your contract between the casino.
Yes you are right. But do you think the reaction is genuine?
I mean if I win playing with my money and what I win is mine, then my reaction being happy is genuine.
Somebody that can't keep his winnings probably and still is freaking out, that looks very staged then.
*Entering joke side.
He/she genuinely happy because even bet with sponsor money, he still got money paid from the sponsor depending the type of sponsor how many percetange they can only take from total balance they are win or other promo paid ~XD. Back to reality is up to you to like it or not, is all about entertainment but just want to spoked that's why you need to divided your streamer or at least choose only a streemer who deposit by their own money.
You can take example, "LetsGiveItSpin" in the end of his stream or started he showing on LIVE his email or skyrill account while depo or withdraw.