Two reasons: the humans writing the emails are not native speakers of the language and to bypass keyword filters. If the keyword filter blocks “porn” then misspelling the word to “pron” or “p0rn” will allow the emails thru until those misspellings are added to the filter. Computers are very literal and only block the exact spelling in the filter. Humans are good at non literal things and will usually replace the misspelled word with the correct one.
The continual ebb and flow require constant changes by the phishers and the antiphishers.
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