I boarded a bus going home from the bank yesterday, then I remembered some football match had few minutes to kick-off then I brought out my phone from my pocket to place some bet, immediately I opened the bet app a man sitting next to me, tapped me and said that gambling is Satanic and I should desist from it, at first it sounded so funny and made me laugh but with a serious face he further said that it's manipulated by demons and that's why the house would always have the higher edge. He said he used to be a gambler but stopped when he discovered that and that there are demons helping the casino and sport betting owners to manipulate people into becoming addicted and getting more money from them, they give to selective people knowing fully well more people would lose and they'll gain back what they lost when more bettors lose the old man made it sound real but I don't believe that, i think he's lost too much in gambling before he stopped and is looking for anyway no matter what to discourage people from being like him or he's just being too superstitious. What's your opinion about this please?
You are asking something which cannot be easily replied without having in mind the religious standing of the person answering your question, though. You are literally asking whether demons exist or not. So I am not sure what kind of answering you are expecting beyond people saying this is non-sense and others claiming demons exist.
But keeping that to one side... I believe people who manage casinos and betting services do not need further help from unknown forces, because they already have mathematics in their side, though, and mathematics are in control over both believers and non-believers.
I share your theory on the past of that man, he probably had such nefarious experience with gambling that he started to go church and there he learnt on demons and the unholiness on betting, etc. He found comfort on that and now he has given up on betting and gambling completely. There is nothing wrong with that, since it is a personal choice. Just do which is more appropriate in your eyes, always keeping responsibility as your priority.
I suspect your doubts on demons and angels getting involved in gambling won't get solved in this thread, though, be warned.