Site has been running from more than a decade now and I wish it to run for several more (so I can ROI in time

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They do have a great business that has been lasting a long time and already have good reputation. From above posts, I have my first time to know about past addresses for Freebitco.in and if they still have it (but in new addresses), they actually have very big business fund.
We can speculate as to how the casino can shut down but it will not do us any good, rather take a advantage of the present and invest in freebitco.in while it exists.
Casinos can shut down their operations by many reasons and even by the team proactively shut down when they are no longer want to run the business. I already see Yolodice shut down their business some years ago when the owner no longer want to spend time to operate it.
For a place to be required of showing it, there should be a lack of trust, when a place has paid everyone for 10.5 years, you know they can be trusted without a doubt. I hope that we could show them some respect and trust that they have deserved by being so awesome for the long time. I believe that the best thing we could do would be just a regular situation without a much trouble.
They pay their users well and it's enough. I don't have needs to see their Proof of Reserve and I don't feel I need to see it because of my curiosity.
Have a casino, run it well, pay to winners well, all of them are enough for a trusted business and Freebitco.in clearly has it.