Despite agreeing with your latter points, there's a reason why shrapnel damage is comparably serious.
Although most people who did some porn are most likely not proffesionals, most porn (by volume) is done by people who might even consider your finding part of their CV. So going by sheer numbers alone, there might be so much more cases of false positives. Now, even if it becomes terribly obvious how inaccurate it is, I don't think that matters much when it comes to weaponising it, because people are easily fooled or don't care. As long as you kind find a vid of a girl that looks just like Clara from accounting, you can spread it as a false rumor. Or not even claim it's her; it's just as embarrassing. And that's even assuming you could tell them appart, because the seed of doubt extends the problem to people who didn't even do porn.
For comparison think of deepfakes. Everybody knows it's not actually Emma Watson, but I bet she isn't particularly happy about it.
Although most people who did some porn are most likely not proffesionals, most porn (by volume) is done by people who might even consider your finding part of their CV. So going by sheer numbers alone, there might be so much more cases of false positives. Now, even if it becomes terribly obvious how inaccurate it is, I don't think that matters much when it comes to weaponising it, because people are easily fooled or don't care. As long as you kind find a vid of a girl that looks just like Clara from accounting, you can spread it as a false rumor. Or not even claim it's her; it's just as embarrassing. And that's even assuming you could tell them appart, because the seed of doubt extends the problem to people who didn't even do porn.
For comparison think of deepfakes. Everybody knows it's not actually Emma Watson, but I bet she isn't particularly happy about it.