well, is totally different to see a streamer playing with $1k than a streamer playing with $9M... And that is why these streams are that attractive to users, because is crazy to see guys playing $50k hands on blackjack, or doing $100k bonus buys, is just a high-quality bait.
But i wouldn't say is fake money, streamers have a roll-over, just like the depo bonus rules, if they can bet the starting balance X times, then they can keep the money. Each casino have it's own rules about this.
Every streamer has a different deal. Some have the rollover like you mentioned, some just have to stream for x hours and keep what's left, and some have to stream and get to keep 10% of the balance that's left. There are other deals out there as well, but they all depend on many factors. How many viewers you get in your stream on average, how many followers you have, how often you can/will stream, what sort of balance you want to play with, etc. All of this is considered before a casino will even offer you a deal, if certain numbers aren't there then a casino will not offer you a deal. You also have to have depositors if/when you get a deal. If people aren't making deposits under your code, you will lose your deal within 2 weeks. Casino has to be gaining something from you or there is no point in having you on their payroll.
If you are a streamer with a nice number of viewers( not from a viewbot as that's worthless)(min 50-100 average viewers) and have an active chat, I may be able to get you a deal. I would have to verify a few things before getting you in contact with my contact. Send me a pm or message on telegram @yahoo62278 and maybe I can help you out. Don't waste my time though, I'm not contacting anyone for you if you have a viewbotted channel. It's pretty easy to spot.