As long as they don’t take this motivational quote literally then everything is fine. Gambling can be a bonding activity among friends. Making a few friendly bets in a group chat is something normal that a lot of people do and they don’t necessarily view it as gambling because you don’t risk anything significant. If it’s an activity you are doing outside of group chats then it is your responsibility to not let it become a harmful habit. It might feel compulsory but if your friends are reasonable people they will understand if you need to take a break for a while.