This to me is a traditional view which remains persistent until the very day.
My mother considered gambling as playing with money. She sternly reminded us not to gamble. When I was in college, there was a hot debate within the church whether or not to accept donations coming from dirty sources such as gambling. And in Islam, gambling (maysir) is haram (forbidden). [1]
I have a friend whose father would not serve the family food bought using gambling money.
And just a few years ago, our Education Secretary shunned billions of state-funds because they are coming from gambling. She didn't think it moral and proper to buy books and even build classrooms using the dirty gambling money. [2]
What are your thoughts on these? Do you agree with it, or you consider these as old-fashioned views?
So many factors and it depends on your status, and the society where you belong, like if you live in a country where shariah is the governing rules and Islam is the religion, you should respect what your religion preach to their followers, but if you are living in a liberal country and where gambling is very prevalent, then I don't think you will consider gambling is dirty money.
Yeah it depends on where you stand, if you believe in your religious teachings then do it and obey it. nobody forces you to play gambling. dirty money or not depends on everyone's perspective, because we know that everyone has various teachings about the law in life of their religion