If you work as a staff member in a physical casino as a dealer or in a sports bookie, I know that there are subtle ways you can use to encourage responsible gambling that will not go against the terms and conditions for staff.
For example, suppose you encounter a gambler who has wagered $200 at the table and is currently winning $6k. Would you express to them, "Hey, you're up $6k, and you initially entered this table with $200. Walk away, Take your winnings, go!" or will you say, "It is very admirable to know when to stop"?
What will you say within your limits to encourage responsible gambling?
You'll get fired by your managers for doing that, it's not your business to tell the players what to do how to behave, and what to do with their money it's their money, and whatever reason they are in the casino it is none of your business, you are a misinformed staff if you do that to a player.
The staff's work is to serve the players and not to give advice on what to do and in case a player comes to you to ask for advice it is unethical to give him a piece of advice, your casino is the one paying you your salary and if you shut out gamblers then you don't deserve your salary.
I have never encountered this while playing in a casino the players can complain to the management of harassment if you give them advice on what to do with their money, you should act like a staff and not as an adviser.