Thank you all for the kind support. There is a bit more crazyness behind the win - I won like 3Euro free Casino money. That's what I was gamebling with - with a total wager of 30Eur. So I literally spent no money at all. Thats why my account shows up 0,79Eur. It went into the freegames 2 times, and this win is from the second one.
I ended up taking 4280Eur out.