One of the best betting exchanges on the globe - BetOnBet have shut down after a short time as bookmaker.
Honest companies are hard to find, I did won a lot at betonbet.
This also happened to ParBet. They closed their betting exchange, now ParBet only have Poker and Casino. ParBet was a outstanding betting exchange but probably did not reached the turnover needed to make profit from small commissions.
I suggest you move to this bettingexchange.
So you stay with honest companies that pay when you win.