Yesterday
I deposited $40 into Nitrogensports
I betted on a game and won from 0.06 Btc > 0.11 Btc
This morning
I Woke up and bet 0.05 btc on a game
And the game lost.
So thinking to cash out what i have deposit, i access to my account. I look at my balance : 700 satoshi left.
I bet 0.05 Btc on 8.30 AM
And on the 8:52 AM, there's a withdrawal went out to some random address.
My email is not notified, nothing. The money just gone.
This is the first time i lost my money on website because of hijacked by people.
Most of my account is activated with 2FA, email request before withdraw and bla.
Except this, yesterday is the first day i deposit the money and on the next day, my money is gone.
Therefore, put security settings on your account to protect yourself

You should always activated 2fa on every site(if it's available), i had lost .6 btc for not activating 2fa on poloniex since then i activate 2fa on every site.