You have invested 20k doge and came back with almost a %10 return, that is a very very big return when you look at it % wise. Sure 2k doge is not really that much itself but that means if you had 200k, you would have 20k as well, hence why its awesome return when you consider the 10% part. About the login, could it be api? I don't know if there is any api that allows all of this, exchanges do have it but I don't know about the casinos, I have a feeling that if there is api, you do not even have to login to anywhere to withdraw someone's money.

There are plenty of dice auto system type of deals, where you use it (most trustable one is seuntjie for example) and it logs in for you instead of you and maybe that way someone got a hold of your account and stole it? I agree that just because one account was hacked, it doesn't mean the whole website was hacked.