If someone wants to scrape your website badly enough, they'll find a way.
Use a really bad font with terrible kerning and very similar 1lI and oO0, etc.. /s
Spellcheckers and error-correcting OCR are a thing. In fact, spellchckers are so well-understood that they're a frequent assignment for CS undergraduates.
Great idea. I'll keep this in my back pocket for future use.