From what I understand from several cases arisen recently, Anonibet is a clear ponzi scheme, holding people's money and delivering their winnings based upon deposits.
I suspect that they are insolvent now. That's why I had written to Bitcoin Foundation to investigate these issues and organize a financial audit for Anonibet.
Alternatively, Anonibet may show evidence that they are financially stable.
A financial audit by a 3rd party is definitely in order at this point.
The bonus being offered will bankrupt any sportsbook offering it.
The only way Anonibet will avoid this is to accept losses, and withhold winnings.
And it is definitely an indicator of a Ponzi.