You can paint them red til you are blue in the face and it will mean nothing as you are not a DT user and it won't stick out except to you. You don't have to agree with or like a casino's practices, but they do not share info openly. It's done through some sort of mediator. They will not post info here and make potential scammers smarter.
Whenever
I will feel that something wrong is happening I will raise my voice and if unheard I will use the trust system and give negative feedback (I do not care if someone reads that or not). I will do my part.
and if I think is necessary I will also open a flag as suggested by @bitbollo.
Having said that I understand that there are many things that I do not understand and I have to be more cautious when blaming anyone for any wrong but there are also a few things that I do not care about (how others perceive the importance of my actions).
I am not forcing the casino in question to openly reveal any sensitive information neither I am conclusively inclined towards the casino's fault. All I was doing was answering to a hypothetical scenario posed by another member.
Uhh... sadly, there are other reason that would involve multi-acc other than gaining edge [exploiting bonus] or circumventing betting limit. I happened to have my eyes open to that "shade" of gambling world when someone misjudged my character and offered me a uhh... business.
I'm afraid I can't be more specific more than above in concern that I'll spark ideas to a reader with malicious intent. But... yeah, there are other situation that's profitable from having several accounts.
I understand and trust you as you are dealing with similar cases in a daily manner and you have much more exposure to how things work inside and out.
But still, if OP is willing to risk his privacy and identity in order to get it resolved I think this gives casino more flexibility to prove the case in public. Now if opening some secrets is making scammers smarter (which is already open if OP is using it) then casinos have to make their system robust vs working in an opaque manner.