Notify the Online Players Association . They will if they are smart. Saavy casino operators know that the odds are always on their side. The more players win, the more the house wants them to stay and give it back. It is common, however, for e-casinos to stop extending cash bonus offers to players who never stay long enough to lose.
Sports books are a different matter.
A few large-stakes professional sports bettors have been barred or even had their money confiscated. There have also been more cases of flat out stealing by the offshore bookies than by e-casinos. Casual bettors who stay with well-established books should be okay. I'll send it back as soon as I can.