I think it's wrong to upload someone's photo without their consent or knowledge, but I don't think this is right either.
Apps like these show the apathy of authorities towards slander (especially of men) and the presence of predators who want to worsen and take advantage of the gender wars and other forms of bigotry. Ultimately, people must introspect and reassess the influence of these venomous propaganda on their biases and emotions. This sort of radical beliefs is never healthy for anyone.