Our Tournament style contests have guaranteed prize pools (GPP) as well as Non-GPP.
You can identify the Guaranteed Prize Pool contests, in the Lobby, by the ones with the blue (for OwnersBucks) or green (for real-money) "G" next to the prize amount. GPP contests will run as planned regardless if they fill or not.
Contests without this "G" are Non-GPP and if they do not fill it will disband and all entries will be returned to your account balance.
There may still be rare technical scenarios where OwnersBox may require a contest to be canceled. In that event, all entry fees will be returned to the users.