I would really hope that they don't publish more information and keep algorithms as secret as possible. Algorithms like this can have huge implications in countries where homosexuality is banned. If this really works, people could end up in jail just because a neural network determines that they look gay. And even if it doesn't work, some governments or local communities could still use it to ban people because of the chance that they're gay.

While I'm not a fan of censoring research, I think this is a case where the research community should refrain from publishing results that could help replicating such algorithms.

EDIT: Just to be clear, I don't say that this study makes sense or works. But there are areas where large parts of the population really hate homosexuality. Just thinking this could work can make them use such a system. Especially in situations where you can afford false positives. So next time you want to travel to a country it could happen that they don't let you in because the algorithm says that you're likely gay.