Scams have gotten better since AI. Most of the common spelling mistakes are gone.
I was looking through some phishing e-mails the other day out of curiosity and found a weird unicode character mistranslated. Immediately knew it was an artifact of bad translation. So they're not perfect, but they're damn good.
The common spelling mistakes are there for a reason most of the time.
> a reason
Because people who read the message and think it's professionally written despite the spelling errors have a large overlap with people who will fall for the scam, at least far enough that money is transferred.