The truth is that without Bitcoin or crypto currency there have been gamble but it wasn't as easy as it is right because of the easy deposit and withdrawal methods. But what's really the problem is that like you have said already that it's easy to access gambling sites while sitting at home. So based on my perspectives the easy access to gamble is now the problem and not Bitcoin or crypto currency. Even without crypto currency but easy access to gamble people will still gamble while sitting at home. So crypto currency is not the issue but the easy access to gamble.