Re: These usually involve someone buying something advertised on Facebook, Instagram or Snapchat
It wasn't clear to me from the article whether these were primarily advertisements or just regular posts, offering (bogus) goods for sale from private sellers, as with e.g. Facebook Marketplace.
I mean, in either case I wouldn't engage – I don't even like buying online from (ostensibly) reputable vendors, if I can find a local source. But policing regular SM posts for scams would be technologically infeasible and potentially cause a lot of false positives. And getting rid of things like Facebook Marketplace and Craigslist would largely destroy the private-individual markets in many areas, now that such things have largely destroyed the newspaper classified ads, flea markets, and the like that came before them.
(Yes, I know there are still newspaper classified ads; I read them every week in our paper. And yes, I know there are still flea markets; there's one that happens weekly not far from here. They are greatly diminished.)