We can assume that the people who still gamble are not from the religion that prohibits it or if they are they are not very religious. In reality too, almost every religion is averse to gambling, Islam is the only one I know that expressly prohibits any form of riba which will include gambling and also investing in Bitcoin, but Christianity is not welcoming of gambling either or any other religion for that matter.

I do not expect anyone to openly here discuss how they participate in something that is expressly prohibited by their religion.