Most of us have heard that phishing and other scams are big business. Given many of the errors of grammar, errors of spelling, and so on, it is hard to believe that enough people take them seriously.
I just started getting phrench phishing, and I think it is because at least one of two French speakers I've recently exchanged email with have had their address books hacked.
Even though I generally recognize spam from just the title or sender, I often take a peek at the contents. I was surprised to see that one email supposedly in French may have had a Russian sender; it had securitй instead of sécurité!!
P.S. I did a search on securitй and got 598 hits. It seems to be common usage in Russian to use this blended spelling of Latin and Cyrillic characters, both in a French context and a Russian context.