Why didn't they supply everyone with the same training data?
Same training, same testing, everyone is on a level playing field. If one team can afford to get photos of a million people with consent and another could afford only a thousand, why should the one with more resources potentially win only because it had better training?
Or alternatively, require all contestants to submit their training data (which they MUST have used, no giving data designed to sabotage others) and other entrants are free to use it if they want.