Like a filter? That’s pretty clever. If it works, anyway: I’m not convinced it’s a perfect filter: while “savviness” is a big indicator, perfectly savvy people sometimes fall for the first part of these scams if they’re caught at the right time. And while they don’t usually fall for the second part, they could probably be victimised by (more human intensive) spearphishing, so retaining or reselling their personal info might still be wise, from the scammer’s perspective.

Unfortunately for them even clearly misspelled messages still get the attention of people like me, who end up wasting copious amounts of their time testing their methodology! Although I’ll admit that I’m more likely to end up wasting the time of a more-sophisticated scam because it’s more interesting to see what the latest MO is.

So yes, maybe you’re on to something! I’m not entirely convinced, especially as it’s the characteristic that’s undergone the most rapid improvement, but there could be a nugget of truth. Thanks for sharing!