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

According to the FATF typology report 2000-20011, lawyers can provide a range of functions that can be useful to a potential money launderer, such as:
Creating complex legal arrangements, such as trusts, foundations, or corporations, that can obscure the identity and ownership of the beneficial owners or the origin and destination of the funds.
Buying and selling property, such as real estate, art, or jewelry, that can be used to transfer or store illicit proceeds or to provide a legitimate cover for the source of funds.
Performing financial transactions on behalf of a client, such as opening bank accounts, transferring funds, issuing checks, or exchanging currencies, that can facilitate the movement or concealment of illicit funds.
Providing legal advice, on the other hand, is not a function that can be directly exploited by a money launderer, unless the advice is related to the above functions or to the avoidance or evasion of anti-money laundering laws and regulations.
References:
1: FATF Terrorist Financing Typologies Report - Financial Action Task Force2

Explanation
The most concerning trading pattern for a compliance officer when a new customer has been onboarded in a securities firm is the customer accumulating securities of a low volume counter in small increments on a weekly basis. This type of behavior could indicate that the customer is attempting to obscure their identity or the true purpose of their trading activity, which can be indicative of money laundering or other suspicious activity. (CAMS Manual, 6th Edition, Page 170).

Reference: https://www.americangaming.org/wp-content/uploads/2018/12/Best-Practice-2017.pdf