The most suspicious transaction indicators related to casino activities are:
A client requests a winnings check (cheque) in a third party's name. This could indicate an attempt to conceal the source or ownership of the funds, or to evade reporting requirements.
Acquaintances bet against each other in even-money games and it appears they are intentionally losing to one of the parties. This could indicate a scheme to launder money through the casino by transferring funds from one party to another without attracting attention.
A client requests the transfer of winnings to the bank account of a third party in a country without an effective anti-money laundering regime. This could indicate an attempt to move funds to a high-risk jurisdiction or to a person or entity that is involved in illicit activities.
The option that is not suspicious is:
A new client who is a large volume player asks the casino operator about the ability to transfer the funds to other locations in the same country. This could be a legitimate inquiry from a high-net-worth individual who travels frequently and wants to access their funds conveniently.
References:
ACAMS CAMS Certification Video Training Course - Exam-Labs1
Exam CAMS: Certified Anti-Money Laundering Specialist (the 6th edition)2 ACAMS Study Guide for the Certification Examination, 6th Edition, Chapter 8, page 173
https://www.acams.org/wp-content/uploads/2019/08/ACAMS-Study-Guide-6th-Edition-Chapter-8.pdf