I guess it depends on the applicant but one of the guys who posted on there added full gdd. Anyone could just grabbit like ubisoft or nintendo, quickly patent it and make profits.
Gotta be carefull with your IP.. maybe make an NDA if you want to commercialize the project later on, if its open source then it dont matter.
But yeah that TOS refunable thing is very sus.. i mean if service is free then how can you process the payement ? Maybe applying to the job cost money?