The team of the casino may not be involved in such activity but there are some greedy staff in the company that can do that. We can give benefit of doubts to some reputable platform but you don't know so well what is going on behind the scene.
Staff members are part of team. But, based of the context of your reply, by "team" I suppose you are referring to the casino owners, right?
Hiring staff members is the owners' responsibility. So, if something goes wrong, the owners still bear part of the responsibility.
Besides, there should be some kind of restrictions on who can access sensitive data such as users' private information.
Unfortunately, not all casinos take their users' privacy seriously. I once witne3a case where the live chat agent asked the customer to upload his documents via the chat window!
Staff; being the same or part of the main team of a company depends on the company's settings and mode of operations, otherwise, I will tell you that staffs are very different from team.
A team is like the group of persons who are working together, hand in hand with the founder/CEO of the company to build the company's product, while a staff is like a customer care, errand person who is hired to either attend to the company's customers, take note of their issues, complaints and report such to the team, or someone who is hired to simply run errands for the team.
And when it comes to hiring a staff, there is always, or suppose to be a HR(human resource) person in the team who oversee to the screening of new applicants, and shortlisting the best ones that qualify to be hired as a staff, now it is up to the management team to decide who gets hired and who's not, hiring a staff is not completely the responsibility of the founder/CEO of the company, but hiring or promoting an existing staff into the management team/board; is more of his or her responsibility(the CEO's).
I hope this is clear enough to easily understand.