How come phishing mails can have such a bad grammar?

Hi,

I'm reading about phishing, I am no expert at all, just find the creativity behind interesting. Anyway, I assume it's some kind of script, with already pre-written message (when it comes to email), so how come most of these are obviously phishing based on the words/grammar/etc.? Okay It might be that the attacker is someone who clearly can't write, but I am yet to see a phishing mail that's so perfect, you can't really tell.

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