I don't think that it's a better advice to tell others to stay away from a thing that you're promoting yourself, but yeah someone should tell the new gamblers in detail that over-gambling can learn to gambling addiction and one should gamble in limit in order to enjoy the fun part of it. There are many new-comers who start gambling because they want to earn quick bucks by betting on the casinos games but they don't know that in the world of gambling we don't win all the times and sometimes we also face many losses. A gambler should consider gambling as a type of entertainment rather than considering as a way to earn a lot of money.

If you don't agree with something then you should not promote it but if you're promoting something then you should at least don't advice others to stay away from it. I agree with you that one should tech others about gambling responsibility because responsible gamblers will never get addicted to gambling and they can enjoy gambling as a fun activity, and might earn some revenue if they are lucky. The luck plays a very important role for the gamblers and one should teach them that if at certain days they're facing many losses then they should stop gambling activity for a few days or limit their hours to 1 or 2 everyday.