i had something similar happen on my bwin account.
suddenly i had 14k more € on it. i also had some super strange transaction history showing up.
contacted support and everything was back to normal a day later.
a few days later i noticed 140€ more and that weird transaction history again.
this time they closed my account.
now i have to "be responsilbe for every payment in that account" or it stays closed.
ofc i triple checked all my devices and mail accs on some kind of breach but i couldnt find anything.
bwin acc is still closed
@topic will be interesting to see hot this matter progresses