That's not true. You can submit your results and then refuse to release your algorithm, disqualifying you from the competition.
"Upon qualifying, as described above, the Participant is required to submit within one (1) week for judging a description of their algorithm along with all source code. The Participant warrants that the source code is either fully or substantially developed and functions or will function as represented by the description. Failure to deliver both the description and source code within one (1) week will disqualify that entry and additional qualifying entries will be considered."
Ok missed that part in the contract... it was a bit long and in legalese.
I'll tinker with it to fit it to the problem (different algorithm category, mine is best fitted for classification problems and the test is a clustering problem. The dataset needs to be manipulated a bit first for it to work )
"Upon qualifying, as described above, the Participant is required to submit within one (1) week for judging a description of their algorithm along with all source code. The Participant warrants that the source code is either fully or substantially developed and functions or will function as represented by the description. Failure to deliver both the description and source code within one (1) week will disqualify that entry and additional qualifying entries will be considered."