I don't know anyone who has been successfully targeted by the black widow scam, but I've noticed reports of it increasing, and Jan's post from the Embassy suggests that it's not just empirical accounts either.
The targets of scams seem to all be the same: young, single, males thinking with the wrong head if you know what I mean. This isn't to victim blame, it's horrible that this happens to them, but guys need to me smart about looking for a casual encounter while abroad, especially if they don't speak the language and are traveling alone.
These are the current scams I'm aware of. People I know/have met either have been the victims of them, or targeted by them, but caught the signals in time:
For straight males, the scam involves a pretty woman or sometimes even two striking up a convo with them at a bar or club, and then being direct about suggesting they head back to the tourist's hotel room or Airbnb. Before the guy knows it, he's been drugged via his drink as he's leaving, and instead of getting lucky, he gets "helped" back to his room, and robbed as others have said, often with anything not nailed down growing legs.
For gay/bi males, the scam involves a stronger man targeting a man assumed to be physically weaker to shakedown for their phone/wallet, i.e. the scammer pretends to be looking to meet on a hookup app, and robs the victim when meeting, sometimes with accomplices. Other times it's all digital, blackmailing men by threatening those who aren't out of the closet to reveal their orientation to family/friends/coworkers, expose acts of unfaithfulness to a spouse or partner, or to share their nude images family/friends/coworkers (though this doesn't work as much as it used to). The best way to avoid the later is not to connect social media to apps like Grindr, which should go without saying...
Finally, for both, there's a WhatsApp scam where the scammer sends sexually explicit images, asks for them in return, and then claims to be a minor before passing off the victim's number to their accomplice posing as a cop working at a neighborhood comisaria who will take a fine (bribe) to make the whole problem "go away". I've noticed a lot of Argentine guys fall for this, and less so tourists/foreigners, but scammers don't discriminate. This scam disproportionately targets straight men. While I'm sure they exist, the overwhelming majority of women don't want pics of your business, so odds are if someone is asking you for it, they're either trying to scam you, or they're catfishing.