It's an app that exposes the identity of people against their will. That's the exact definition of doxxing.

Whether the original intent was honourable or not - or if they decide to spend part of their income to a honourable cause - does not factor in to the nature of the system.

Worse, in some jurisdictions (I’m not certain about the US specifics), this kind of unsanctioned exposure could actively hinder legal prosecution of actual predators. If a person is publicly accused on a non-official platform before trial, any resulting lawsuit might be thrown out on grounds of prejudicial exposure or even perjury. The accused could claim that the testimony is tainted or retaliatory — particularly if the platform enables near-anonymous posting without formal vetting^1.

[1] Yes, the app collects driver’s licenses. But let’s be honest: in the U.S., a fake driver’s license is practically a rite of passage. Entire generations of underage teens have used them to get into clubs and bars. If that’s your trust anchor, you don’t have much of one.

So the system is fucked, as I see it.