Absolutely wrong. What do you think? How it can be right? You should be a lucky gambler/punter to win every single bet/session. Proper money management and pure luck are the enough excuses for "winner". İf you can not earn your expenses it is called Gambling
If our mindset with gambling is for fun and entertainment, I don't think so that gambling is 100% wrong. It may even relieve our stress and just have a good time provided that we are only using money that we can afford to lose and that we are ok even if we can't get it back again.
Make money from gambling was not good and it was wrong. People generally try to earn money from good work and real work. But if they play only for entertainment it's natural. But they would be addicted to either winning and losing waste all their money just because the gambing.
It's not that easy to get addicted to something that you don't often do but once you get the taste of the winning moments, the large prizes that make you feel that you can buy anything, that's the part in your life that could get you addicted to it and soon enough you won't be enjoying it because you spend a lot of money in it and you become addicted and like you said, you waste money on it.