My point is couldn't someone exploit that with a website that has a url matching a common grammatical error of this type?

You could put the chicken before the egg too by making a bunch of bot comments hat appear plausible except for errors like that and then actually launch the website right?

If I "accidentally" link to that hostile website by making a totally normal "grammatical error" how do you establish intent?

From a zoomed out database/admin level how do you quickly tell the difference between the two in bulk amounts of posts/comments you can't possibly search all the way through by hand...?