The article misses one of the most common misspelling reason: getting thru Bayesian filters. It has more to do with tech and less with psychology.
This is true but also... In my experience[1] a large majority of facebook-level romance scammers use the same copypasta messages when possible, because they actually are from (e.g.)Nigeria and really do have poor English. This is especially relevant to your point because facebook could EASILY be flagging people based on known pasta messages, for review or shadowbanning etc. They presumably don't do this because "not…
They don’t care. It’s that simple. I’ve (on Facebook/Instagram) reported scams, and they always say it doesn’t violate their community guidelines. But it turns out the computer “reviewed” my report, so I appeal it, and it’s always “sorry, but we don’t have enough people, so we’re ignoring this appeal. Here’s the report ID for the ‘review’ board.” On the rare chance a human does review it, they say “a human reviewed your report, and you’re right.”
They so much don’t care that, now, reporting scam/spam just says, “thanks for letting our system learn” without a way to make an actual report. I’ve given up reporting scam/spam.
For a real kicker, I’ve reported a literal terrorist threat-like post, and it was still “pending” after a week.