I can't blame the casino for a mistake you made three times in a row, and I don't understand how you could have made the same mistake again. However, I can't find any explanation for why Roobet wouldn't refund, especially now that the Tron network is supported and funds can be accessed through the automated system, despite the fact that this was possible manually even without the supported network.
Maybe because if they frequently forgive mistakes of users, they'll face mistakes from them regularly and it will turn into a mess for them. To my mind, in such a case, it's better to block users from depositing in this specific network than not to refund them when you have access to that network.
On the other hand, a whale player who is wagering millions of dollars is supposed to be taken into account. Why would I, as a casino, lose a loyal player willing to deposit millions just to receive a small amount that he accidentally sent? Honestly, I no longer see the logic behind all these practices that are supposed to stem from professionalism and experience in the field.
You might not believe but employees do not care much about the company. They are hired people who want to finish their job at 5 PM and get home ASAP. Company owners do not care much too, they generate good profit anyway and spend life nicely, so they do not get into too many details and employees hide this from them. This is why business owners should closely monitor operations in their company.