Of the three billion or so people on Earth who enjoy web access, roughly half speak – and write – mainly in English. If they’re at all like a typical Grammarly user, they crank out around a thousand words each week, mainly in email, social media, blogs, and the like.
One other thing folks writing on the Internet do a good bit of is make mistakes. We routinely mangle proper spellings, savage the rules of punctuation, email sensitive details to the wrong person, and mix up words – say by referring to an ambidextrous baseball pitcher as “amphibious” while hurriedly dashing off a newspaper headline.