Lets be honest. Playing with non-withdrawable money is the easiest way for a streamer to do and attract customers as well. The chances of someone having his deposits sponsored is rare, but possible. The thing is that when someone does that, he agrees to terms with max cashout policy. So if someone plays sponsored money, eg. 1000 euros and wins 20000 euros, he might not get it all, since the terms he agreed to with, states a 10x max cashout policy. So 10k euros.
Streamers usually play with affiliate money. Especially if the affiliation money is good a particular month, they might also bet higher, but not a 50euro bet for crying out loud.
The biggest problem with the fake streamers is one thing only. They bet high, making it look fun to the audience. So thats against protected gambling.
If i bet a 20 euro bet per spin, i will not even crack a smile. If i hit a bonus with a 20 euro bet, you will see sweat and relief. Not acting like its a usual thing.
Most of them, are playing with their phones while they hit a 1000x with a 20-40 euro bet, and the funniest thing is that, THEY DONT EVEN KNOW THE LINES!!!