HE KNOWS BETING PATTERN AND WHEN WHALE CREATES NEW ACCOUNT HE GIVES HIM LOOSING SEED!
AND WHEN YOU SET CLIENTSEED HE KNOWS IT AND WHEN YOU REQUEST NEW SERVER SEED HE AGAIN GIVES YOU LOOSING SEED!!!
There's no such thing as a "losing seed", as you're able to change if you want to bet high or low and what odds. Anyway, just pick your own client seed after seeing the server seed hash, and you have nothing to fear.