I believe all of these are assumptions. It is hard to say anything without a proven fact. We all know both the online and land based casino are here to make business and generate money for the owner, that is why there is this house edge thing.
That's very true because in both online and real world gambling it's the house that's the winner. Gamblers win occasionally but the house always remain in profit. If you are getting into gambling then you have to accept this fact that more money flows from gambler to casinos then from casino to gamblers. I can't say whether real world casino machines are more tempered compared to online casinos but the whole gambling industry is designed in a way that house keep winning and gamblers keep losing.