Of course they are unrealistic. The gamblers/streamers aren't actually risking anything, so they aren't worried about losing anything. They get funds from the casino to play and then in the end, most likely they return the funds to the casino. They get paid one time for each stream. If you don't risk anything and you have free money to play with, you would be taking those crazy risks like those streamers too. I am sure you have tried playing those slots with free play and playmoney. You make crazy bets when playing those, don't you?
I once thought that the streamers who got big wins were indeed something that had been previously planned between the streamer and the casino in the sense that there was cooperation with each other, with perhaps what could attract many people is when the balance owned by this streamer is about to run out but a miracle happens with the streamer who can get a big win, this can certainly attract many people who watch it, especially those who are blinded by winning in gambling will definitely visit the casino and will try their gambling to get the victory as shown in a video or obtained by the streamer.
Actually we must be able to see that winning in gambling can be said to be based on our luck alone, so no matter how hard we try but if it is not the time when luck is on our side then there will be no victory that can happen, and vice versa, for example, if we play carelessly but there is luck on our side then victory can happen.