That makes sense but I don't know if you can really draw a parallel between email and these devices:
(1) Sending email is nearly free, creating devices is not. Not sure if the economics match.
(2) False positive filtering matter because spammer need to manually reply to emails, creating more work. But with these devices this is not the case, it's all automated. There is no need to filter out smart people.
This only makes sense if the bad grammar is prior to the expensive part of the scam. In this case the expensive part of the scam was mailing the thing. So the funnel doesn't work.
I'm not convinced that argument makes sense in this context, they want you to plug the thing in. They're not trying to filter for gullibility, they want to be as convincing as possible.
(1) Sending email is nearly free, creating devices is not. Not sure if the economics match.
(2) False positive filtering matter because spammer need to manually reply to emails, creating more work. But with these devices this is not the case, it's all automated. There is no need to filter out smart people.