That won't work for long. I've already seen reddit karma farming bots that introduce typos into repost titles to avoid duplicate detection. It'll be pretty easy write a program that takes a piece of slop text and swaps one word or so in every few hundred with a typo just a small Hamming distance away.
Maybe I should get my eyes checked because I was like I don't see it, looks like what I meant to write to me. It took the other commenters for me to finally see it. Ah yes assault not adult there...