They can just as easily get money from those 4 out of 5 that they don't solve and probably make up various excuses that these users acted against their TOS to not pay and refuse withdrawal.
In case of rules violation unfairly received wins could be frozen, but deposits are returned (in case they weren't withdrawned yet). Which means in worst scenario both a player and a casino will remain with a 0 loss.
Sincerely,
1xBit team
deposit money in you. but I never made a withdrawal?
explain it. you just closed my account